639311344 has 40 divisors (see below), whose sum is σ = 1418882400. Its totient is φ = 273358848.

The previous prime is 639311339. The next prime is 639311353. The reversal of 639311344 is 443113936.

639311344 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

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, 43932 + ... + 56644.

It is an arithmetic number, because the mean of its divisors is an integer number (35472060).

Almost surely, 2^639311344 is an apocalyptic number.

It is an amenable number.

639311344 is an abundant number, since it is smaller than the sum of its proper divisors (779571056).

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

639311344 is a wasteful number, since it uses less digits than its factorization.

639311344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13177 (or 13171 counting only the distinct ones).

The product of its digits is 23328, while the sum is 34.

The square root of 639311344 is about 25284.6068587194. The cubic root of 639311344 is about 861.4646683362.

The spelling of 639311344 in words is "six hundred thirty-nine million, three hundred eleven thousand, three hundred forty-four".