30928872 has 32 divisors (see below), whose sum is σ = 83270880. Its totient is φ = 9516480.

The previous prime is 30928853. The next prime is 30928907. The reversal of 30928872 is 27882903.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a self number, because there is not a number n which added to its sum of digits gives 30928872.

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, 49254 + ... + 49877.

It is an arithmetic number, because the mean of its divisors is an integer number (2602215).

Almost surely, 2^30928872 is an apocalyptic number.

It is an amenable number.

30928872 is an abundant number, since it is smaller than the sum of its proper divisors (52342008).

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

30928872 is a wasteful number, since it uses less digits than its factorization.

30928872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99153 (or 99149 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 39.

The square root of 30928872 is about 5561.3732117167. The cubic root of 30928872 is about 313.8976230541.

The spelling of 30928872 in words is "thirty million, nine hundred twenty-eight thousand, eight hundred seventy-two".