639065916 has 24 divisors (see below), whose sum is σ = 1656837840. Its totient is φ = 213021936.

The previous prime is 639065897. The next prime is 639065929. The reversal of 639065916 is 619560936.

639065916 is a `hidden beast` number, since 639 + 0 + 6 + 5 + 9 + 1 + 6 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2958531 + ... + 2958746.

It is an arithmetic number, because the mean of its divisors is an integer number (69034910).

Almost surely, 2^639065916 is an apocalyptic number.

It is an amenable number.

639065916 is an abundant number, since it is smaller than the sum of its proper divisors (1017771924).

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

639065916 is a wasteful number, since it uses less digits than its factorization.

639065916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5917290 (or 5917282 counting only the distinct ones).

The product of its (nonzero) digits is 262440, while the sum is 45.

The square root of 639065916 is about 25279.7530842372. The cubic root of 639065916 is about 861.3544170928.

The spelling of 639065916 in words is "six hundred thirty-nine million, sixty-five thousand, nine hundred sixteen".