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, where r is a prime greater than 3. It has an aliquot sum of 422-number); within an aliquot sequence of thirteen composite numbers (30, 422-number),54,66,78,90,[144](https://bliptext.com/articles/[1](https://bliptext.com/articles/1-number)[4](https://bliptext.com/articles/4-number)[4](https://bliptext.com/articles/4-number)-number),[259](https://bliptext.com/articles/25[9](https://bliptext.com/articles/9-number)-number),[45](https://bliptext.com/articles/[4](https://bliptext.com/articles/4-number)5-number),[[3](https://bliptext.com/articles/[3](https://bliptext.com/articles/3-number)-number)[3](https://bliptext.com/articles/[3](https://bliptext.com/articles/3-number)-number)](https://bliptext.com/articles/[3](https://bliptext.com/articles/[3](https://bliptext.com/articles/3-number)-number)[3](https://bliptext.com/articles/[3](https://bliptext.com/articles/3-number)-number)-number),[15](https://bliptext.com/articles/[1](https://bliptext.com/articles/1-number)5-number),[9](https://bliptext.com/articles/9-number),[4](https://bliptext.com/articles/4-number),[3](https://bliptext.com/articles/[3](https://bliptext.com/articles/3-number)-number),[1](https://bliptext.com/articles/1-number),0) to the Prime in the 3-aliquot tree. From 1 to the number 30 this is the longest Aliquot Sequence. It is also: Furthermore, In a group G, such that, where p does not divide m, and has a subgroup of order 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 science

Astronomy

In other fields

Thirty is:

History and literature

Sports

Music