31912868 has 24 divisors (see below), whose sum is σ = 62760768. Its totient is φ = 14088096.

The previous prime is 31912843. The next prime is 31912879. The reversal of 31912868 is 86821913.

It is a super-2 number, since 2×31912868² = 2036862287970848, which contains 22 as substring.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

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, 12146 + ... + 14537.

It is an arithmetic number, because the mean of its divisors is an integer number (2615032).

Almost surely, 2^31912868 is an apocalyptic number.

It is an amenable number.

31912868 is a deficient number, since it is larger than the sum of its proper divisors (30847900).

31912868 is a wasteful number, since it uses less digits than its factorization.

31912868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26723 (or 26721 counting only the distinct ones).

The product of its digits is 20736, while the sum is 38.

The square root of 31912868 is about 5649.1475463117. The cubic root of 31912868 is about 317.1917954865.

The spelling of 31912868 in words is "thirty-one million, nine hundred twelve thousand, eight hundred sixty-eight".