31664272 has 20 divisors (see below), whose sum is σ = 61821936. Its totient is φ = 15710240.

The previous prime is 31664239. The next prime is 31664309. The reversal of 31664272 is 27246613.

It is a super-2 number, since 2×31664272² = 2005252242579968, which contains 22 as substring.

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, 5458 + ... + 9649.

Almost surely, 2^31664272 is an apocalyptic number.

It is an amenable number.

31664272 is a deficient number, since it is larger than the sum of its proper divisors (30157664).

31664272 is a wasteful number, since it uses less digits than its factorization.

31664272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15246 (or 15240 counting only the distinct ones).

The product of its digits is 12096, while the sum is 31.

The square root of 31664272 is about 5627.1015629718. The cubic root of 31664272 is about 316.3660235550.

The spelling of 31664272 in words is "thirty-one million, six hundred sixty-four thousand, two hundred seventy-two".