30815972 has 12 divisors (see below), whose sum is σ = 58830576. Its totient is φ = 14007240.

The previous prime is 30815933. The next prime is 30815989. The reversal of 30815972 is 27951803.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 350138 + ... + 350225.

It is an arithmetic number, because the mean of its divisors is an integer number (4902548).

Almost surely, 2^30815972 is an apocalyptic number.

It is an amenable number.

30815972 is a deficient number, since it is larger than the sum of its proper divisors (28014604).

30815972 is a wasteful number, since it uses less digits than its factorization.

30815972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 700378 (or 700376 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 35.

The square root of 30815972 is about 5551.2135610153. The cubic root of 30815972 is about 313.5152160648.

The spelling of 30815972 in words is "thirty million, eight hundred fifteen thousand, nine hundred seventy-two".