639364384 has 24 divisors (see below), whose sum is σ = 1277540208. Its totient is φ = 314909760.

The previous prime is 639364379. The next prime is 639364391. The reversal of 639364384 is 483463936.

It is a Smith number, since the sum of its digits (46) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 146962 + ... + 151249.

It is an arithmetic number, because the mean of its divisors is an integer number (53230842).

Almost surely, 2^639364384 is an apocalyptic number.

It is an amenable number.

639364384 is a deficient number, since it is larger than the sum of its proper divisors (638175824).

639364384 is a wasteful number, since it uses less digits than its factorization.

639364384 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 298288 (or 298280 counting only the distinct ones).

The product of its digits is 1119744, while the sum is 46.

The square root of 639364384 is about 25285.6556964616. The cubic root of 639364384 is about 861.4884912736.

The spelling of 639364384 in words is "six hundred thirty-nine million, three hundred sixty-four thousand, three hundred eighty-four".