318638864 has 10 divisors (see below), whose sum is σ = 617362830. Its totient is φ = 159319424.

The previous prime is 318638861. The next prime is 318638891. The reversal of 318638864 is 468836813.

It can be written as a sum of positive squares in only one way, i.e., 257923600 + 60715264 = 16060^2 + 7792^2 .

It is not an unprimeable number, because it can be changed into a prime (318638861) 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 as a sum of consecutive naturals, namely, 9957449 + ... + 9957480.

It is an arithmetic number, because the mean of its divisors is an integer number (61736283).

Almost surely, 2^318638864 is an apocalyptic number.

It is an amenable number.

318638864 is a deficient number, since it is larger than the sum of its proper divisors (298723966).

318638864 is a wasteful number, since it uses less digits than its factorization.

318638864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19914937 (or 19914931 counting only the distinct ones).

The product of its digits is 663552, while the sum is 47.

The square root of 318638864 is about 17850.4583694649. The cubic root of 318638864 is about 683.0192046288.

The spelling of 318638864 in words is "three hundred eighteen million, six hundred thirty-eight thousand, eight hundred sixty-four".