639407164 has 24 divisors (see below), whose sum is σ = 1232780976. Its totient is φ = 287760000.

The previous prime is 639407141. The next prime is 639407173. The reversal of 639407164 is 461704936.

It is a congruent number.

It is an unprimeable number.

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, 67497 + ... + 76384.

It is an arithmetic number, because the mean of its divisors is an integer number (51365874).

Almost surely, 2^639407164 is an apocalyptic number.

It is an amenable number.

639407164 is a deficient number, since it is larger than the sum of its proper divisors (593373812).

639407164 is a wasteful number, since it uses less digits than its factorization.

639407164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143997 (or 143995 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 40.

The square root of 639407164 is about 25286.5016164751. The cubic root of 639407164 is about 861.5077049680.

The spelling of 639407164 in words is "six hundred thirty-nine million, four hundred seven thousand, one hundred sixty-four".