31118664 has 32 divisors (see below), whose sum is σ = 78030720. Its totient is φ = 10341696.

The previous prime is 31118663. The next prime is 31118671. The reversal of 31118664 is 46681113.

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (31118663) 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, 7042 + ... + 10574.

It is an arithmetic number, because the mean of its divisors is an integer number (2438460).

Almost surely, 2^31118664 is an apocalyptic number.

It is an amenable number.

31118664 is an abundant number, since it is smaller than the sum of its proper divisors (46912056).

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

31118664 is a wasteful number, since it uses less digits than its factorization.

31118664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3909 (or 3905 counting only the distinct ones).

The product of its digits is 3456, while the sum is 30.

The square root of 31118664 is about 5578.4105263059. The cubic root of 31118664 is about 314.5383815463.

Adding to 31118664 its reverse (46681113), we get a palindrome (77799777).

The spelling of 31118664 in words is "thirty-one million, one hundred eighteen thousand, six hundred sixty-four".