31696864 has 48 divisors (see below), whose sum is σ = 67510800. Its totient is φ = 14598144.

The previous prime is 31696843. The next prime is 31696871. The reversal of 31696864 is 46869613.

It is a self number, because there is not a number n which added to its sum of digits gives 31696864.

It is a congruent number.

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, 21792 + ... + 23200.

It is an arithmetic number, because the mean of its divisors is an integer number (1406475).

Almost surely, 2^31696864 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31696864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33755400).

31696864 is an abundant number, since it is smaller than the sum of its proper divisors (35813936).

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

31696864 is a wasteful number, since it uses less digits than its factorization.

31696864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1475 (or 1467 counting only the distinct ones).

The product of its digits is 186624, while the sum is 43.

The square root of 31696864 is about 5629.9968028410. The cubic root of 31696864 is about 316.4745314001.

The spelling of 31696864 in words is "thirty-one million, six hundred ninety-six thousand, eight hundred sixty-four".