31697472 has 56 divisors (see below), whose sum is σ = 88290400. Its totient is φ = 10008576.

The previous prime is 31697459. The next prime is 31697483. The reversal of 31697472 is 27479613.

It is a self number, because there is not a number n which added to its sum of digits gives 31697472.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 697 + ... + 7992.

Almost surely, 2^31697472 is an apocalyptic number.

31697472 is a gapful number since it is divisible by the number (32) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31697472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44145200).

31697472 is an abundant number, since it is smaller than the sum of its proper divisors (56592928).

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

31697472 is a wasteful number, since it uses less digits than its factorization.

31697472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8723 (or 8713 counting only the distinct ones).

The product of its digits is 63504, while the sum is 39.

The square root of 31697472 is about 5630.0507990603. The cubic root of 31697472 is about 316.4765548945.

The spelling of 31697472 in words is "thirty-one million, six hundred ninety-seven thousand, four hundred seventy-two".