31618664 has 32 divisors (see below), whose sum is σ = 73915200. Its totient is φ = 12318720.

The previous prime is 31618663. The next prime is 31618669. The reversal of 31618664 is 46681613.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (31618663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25049 + ... + 26280.

It is an arithmetic number, because the mean of its divisors is an integer number (2309850).

Almost surely, 2^31618664 is an apocalyptic number.

It is an amenable number.

31618664 is an abundant number, since it is smaller than the sum of its proper divisors (42296536).

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

31618664 is a wasteful number, since it uses less digits than its factorization.

31618664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51353 (or 51349 counting only the distinct ones).

The product of its digits is 20736, while the sum is 35.

The square root of 31618664 is about 5623.0475722690. The cubic root of 31618664 is about 316.2140567502.

The spelling of 31618664 in words is "thirty-one million, six hundred eighteen thousand, six hundred sixty-four".