30 (number) - Wikipedia
https://en.wikipedia.org/wiki/30_(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 2 × 3 × r, where r is a prime greater than 3. It has an aliquot sum of 42, which is the second sphenic number.. It is also: A semiperfect number, since adding some subsets of its divisors (e.g., 5, 10 and 15) equals 30.
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