30972928 has 88 divisors (see below), whose sum is σ = 73692000. Its totient is φ = 12730368.

The previous prime is 30972919. The next prime is 30972947. The reversal of 30972928 is 82927903.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 207798 + ... + 207946.

Almost surely, 2^30972928 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 30972928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36846000).

30972928 is an abundant number, since it is smaller than the sum of its proper divisors (42719072).

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

30972928 is a wasteful number, since it uses less digits than its factorization.

30972928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 205 (or 187 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 40.

The square root of 30972928 is about 5565.3326944577. The cubic root of 30972928 is about 314.0465940296.

It can be divided in two parts, 309 and 72928, that added together give a palindrome (73237).

The spelling of 30972928 in words is "thirty million, nine hundred seventy-two thousand, nine hundred twenty-eight".