31318864 has 20 divisors (see below), whose sum is σ = 61676980. Its totient is φ = 15402240.

The previous prime is 31318853. The next prime is 31318867. The reversal of 31318864 is 46881313.

It can be written as a sum of positive squares in 2 ways, for example, as 627264 + 30691600 = 792^2 + 5540^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31318867) 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, 15069 + ... + 17020.

It is an arithmetic number, because the mean of its divisors is an integer number (3083849).

Almost surely, 2^31318864 is an apocalyptic number.

It is an amenable number.

31318864 is a deficient number, since it is larger than the sum of its proper divisors (30358116).

31318864 is a wasteful number, since it uses less digits than its factorization.

31318864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32158 (or 32152 counting only the distinct ones).

The product of its digits is 13824, while the sum is 34.

The square root of 31318864 is about 5596.3259376130. The cubic root of 31318864 is about 315.2114612717.

The spelling of 31318864 in words is "thirty-one million, three hundred eighteen thousand, eight hundred sixty-four".