31320864 has 48 divisors (see below), whose sum is σ = 91355040. Its totient is φ = 10440000.

The previous prime is 31320853. The next prime is 31320889. The reversal of 31320864 is 46802313.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (48).

It is a Harshad number since it is a multiple of its sum of digits (27).

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, 17262 + ... + 18989.

It is an arithmetic number, because the mean of its divisors is an integer number (1903230).

Almost surely, 2^31320864 is an apocalyptic number.

It is an amenable number.

31320864 is an abundant number, since it is smaller than the sum of its proper divisors (60034176).

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

31320864 is a wasteful number, since it uses less digits than its factorization.

31320864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36270 (or 36256 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 31320864 is about 5596.5046234234. The cubic root of 31320864 is about 315.2181708542.

The spelling of 31320864 in words is "thirty-one million, three hundred twenty thousand, eight hundred sixty-four".