31297712 has 20 divisors (see below), whose sum is σ = 63831480. Its totient is φ = 14825088.

The previous prime is 31297711. The next prime is 31297741. The reversal of 31297712 is 21779213.

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (31297711) 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, 51173 + ... + 51780.

It is an arithmetic number, because the mean of its divisors is an integer number (3191574).

Almost surely, 2^31297712 is an apocalyptic number.

It is an amenable number.

31297712 is an abundant number, since it is smaller than the sum of its proper divisors (32533768).

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

31297712 is a wasteful number, since it uses less digits than its factorization.

31297712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102980 (or 102974 counting only the distinct ones).

The product of its digits is 5292, while the sum is 32.

The square root of 31297712 is about 5594.4358071212. The cubic root of 31297712 is about 315.1404832356.

The spelling of 31297712 in words is "thirty-one million, two hundred ninety-seven thousand, seven hundred twelve".