31172928 has 28 divisors (see below), whose sum is σ = 82478880. Its totient is φ = 10390912.

The previous prime is 31172927. The next prime is 31172959. The reversal of 31172928 is 82927113.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31172923) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 80988 + ... + 81371.

Almost surely, 2^31172928 is an apocalyptic number.

It is an amenable number.

31172928 is an abundant number, since it is smaller than the sum of its proper divisors (51305952).

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

31172928 is a wasteful number, since it uses less digits than its factorization.

31172928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162374 (or 162364 counting only the distinct ones).

The product of its digits is 6048, while the sum is 33.

The square root of 31172928 is about 5583.2721588688. The cubic root of 31172928 is about 314.7211036082.

The spelling of 31172928 in words is "thirty-one million, one hundred seventy-two thousand, nine hundred twenty-eight".