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      30 (thirty) is the natural number following 29 and preceding 31.


      In mathematics



      30 is an even, composite, pronic number. With 2, 3, and 5 as its prime factors, it is a regular number and the first sphenic number, the smallest of the form



      2
      ×
      3
      ×
      r


      {\displaystyle 2\times 3\times r}

      , where r is a prime greater than 3. It has an aliquot sum of 42; within an aliquot sequence of thirteen composite numbers (30, 42, 54, 66, 78, 90, 144, 259, 45, 33, 15, 9, 4, 3, 1, 0) to the Prime in the 3-aliquot tree. From 1 to the number 30, this is the longest Aliquot Sequence.
      It is also:

      A semiperfect number, since adding some subsets of its divisors (e.g., 5, 10 and 15) equals 30.
      A primorial.
      A Harshad number in decimal.
      Divisible by the number of prime numbers (10) below it.
      The largest number such that all coprimes smaller than itself, except for 1, are prime.
      The sum of the first four squares, making it a square pyramidal number.
      The number of vertices in the Tutte–Coxeter graph.
      The measure of the central angle and exterior angle of a dodecagon, which is the petrie polygon of the 24-cell.
      The number of sides of a triacontagon, which in turn is the petrie polygon of the 120-cell and 600-cell.
      The number of edges of a dodecahedron and icosahedron, of vertices of an icosidodecahedron, and of faces of a rhombic triacontahedron.
      The sum of the number of elements of a 5-cell: 5 vertices, 10 edges, 10 faces, and 5 cells.
      The Coxeter number of E8.
      A largely composite number, as it has 8 divisors and no smaller number has more than 8 divisors
      Furthermore,
      In a group G, such that




      |

      G

      |

      =

      p

      n


      ×
      m


      {\displaystyle |G|=p^{n}\times m}

      , where p does not divide m, and has a subgroup of order




      p

      n




      {\displaystyle p^{n}}

      , 30 is the only number less than 60 that is neither a prime nor of the aforementioned form. Therefore, 30 is the only candidate for the order of a simple group less than 60, in which one needs other methods to specifically reject to eventually deduce said order.
      The SI prefix for 1030 is Quetta- (Q), and for 10−30 (i.e., the reciprocal of 1030) quecto (q). These numbers are the largest and smallest number to receive an SI prefix to date.


      In other fields


      Thirty is:

      Used (as –30–) to indicate the end of a newspaper (or broadcast) story, a copy editor's typographical notation
      The number of days in the months April, June, September and November (and in unusual circumstances February—see February 30). Although the number of days in a month vary, 30 is used to estimate months elapsing.
      In years of marriage, the pearl wedding anniversary


      History and literature


      Age 30 is when Jewish priests traditionally start their service (according to Numbers 4:3).
      One of the rallying cries of the 1960s student/youth protest movement was the slogan, "Don't trust anyone over thirty".
      In The Myth of Sisyphus the French existentialist Albert Camus comments that the age of thirty is a crucial period in the life of a man, for at that age he gains a new awareness of the meaning of time.


      References

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    CyberD.org / » Number 30

    CyberD.org / » Number 30

    Number 30 - Free Picture of the Number Thirty

    Number 30 - Free Picture of the Number Thirty

    Nayu

    Nayu's Realm: The magical number 30

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    Premium Photo | Number 30

    About The Number 30

    About The Number 30

    Numerology Number 30 - Why is It Important?

    Numerology Number 30 - Why is It Important?

    Meaning Angel Number 30 Interpretation Message of the Angels >>

    Meaning Angel Number 30 Interpretation Message of the Angels >>

    Number 30 Generic color lineal-color icon

    Number 30 Generic color lineal-color icon

    30 number design - Clip Art Library - Clip Art Library

    30 number design - Clip Art Library - Clip Art Library

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    30 (number) - Wikipedia

    30 (thirty) is the natural number following 29 and preceding 31. 30 is a square pyramidal number. 30 is an even, composite, pronic number. With 2, 3, and 5 as its prime factors, it is a regular number and the first sphenic number, the smallest of the form , where r is a prime greater than 3.

    30 (number) - Simple English Wikipedia, the free encyclopedia

    30 (thirty) is a number. It is an even number. It is divisible by 1, 2, 3, 5, 6, 10, 15, and 30. It is a composite number. It is the number between 29 and 31. In roman numerals it is XXX.

    Thirty Facts About The Number 30 - The Fact Site

    Jan 29, 2016 · The number 30 is known as a Harshad number, or a number divisible by the sum of its digits. In Back to The Future , Marty McFly traveled 30 years back in time. The number 30, separated by two hyphens, is used to indicate the end of a newspaper story (-30-).

    30 Interesting Facts About Number 30 - Amazing Facts Home

    Jun 17, 2023 · Number 30 is an even composite number that falls between 29 and 31 in the natural number sequence. Number 30 holds a special place in mathematics as an even composite number. It is formed by multiplying 2 and 15, and it falls between the prime numbers 29 and 31.

    Number 30

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    Number 30: Power integer. Comprehensive Review

    Welcome to the most comprehensive review of the number 30 ever created. The number 30 possesses remarkable attributes, including–and perhaps most profoundly–its role (along with its prime factors 2, 3 and 5) as a primary organizing principle in the distribution of prime numbers.

    30 (number) - Wikiwand

    30 is a square pyramidal number. 30 is an even, composite, pronic number. With 2, 3, and 5 as its prime factors, it is a regular number and the first sphenic number, the smallest of the form , where r is a prime greater than 3.

    Number 30. Facts about the number thirty (math facts and fun

    Here are some math facts about the number 30: The number 30 is an even number – the 15th even number. The number 30 has 8 factors which are 1, 2, 3, 5, 6, 10,15 and 30. Also the prime factors of 30 are 2, 3 and 5.

    Number 30 - Facts about the integer - Numbermatics

    Your guide to the number 30, an even composite number composed of three distinct primes. Mathematical info, prime factorization, fun facts and numerical data for STEM, education and fun.

    30 Fascinating Facts About the Number 30 - Facts Vibes

    Jul 3, 2024 · The Fascinating Facts and Significance of the Number 30; Most popular facts. The number 30 is the sum of the first four perfect squares (1^2 + 2^2 + 3^2 + 4^2). In mathematics, 30 is an abundant number, meaning that the sum of its proper divisors exceeds; 30 is the atomic number of zinc, a transition metal with a variety of industrial applications.