30972816 has 60 divisors (see below), whose sum is σ = 99067072. Its totient is φ = 8849088.

The previous prime is 30972797. The next prime is 30972847. The reversal of 30972816 is 61827903.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14356 + ... + 16371.

Almost surely, 2^30972816 is an apocalyptic number.

30972816 is a gapful number since it is divisible by the number (36) formed by its first and last digit.

It is an amenable number.

30972816 is an abundant number, since it is smaller than the sum of its proper divisors (68094256).

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

30972816 is a wasteful number, since it uses less digits than its factorization.

30972816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30748 (or 30739 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 30972816 is about 5565.3226321571. The cubic root of 30972816 is about 314.0462154919.

The spelling of 30972816 in words is "thirty million, nine hundred seventy-two thousand, eight hundred sixteen".