308972720 has 80 divisors (see below), whose sum is σ = 841071168. Its totient is φ = 103342080.

The previous prime is 308972701. The next prime is 308972743. The reversal of 308972720 is 27279803.

308972720 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (80).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16232 + ... + 29688.

Almost surely, 2^308972720 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 308972720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (420535584).

308972720 is an abundant number, since it is smaller than the sum of its proper divisors (532098448).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

308972720 is a wasteful number, since it uses less digits than its factorization.

308972720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13518 (or 13512 counting only the distinct ones).

The product of its (nonzero) digits is 42336, while the sum is 38.

The square root of 308972720 is about 17577.6198616309. The cubic root of 308972720 is about 676.0415342756.

The spelling of 308972720 in words is "three hundred eight million, nine hundred seventy-two thousand, seven hundred twenty".