639489160 has 32 divisors (see below), whose sum is σ = 1439919000. Its totient is φ = 255605760.

The previous prime is 639489143. The next prime is 639489181. The reversal of 639489160 is 61984936.

It can be written as a sum of positive squares in 4 ways, for example, as 484088004 + 155401156 = 22002^2 + 12466^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 639489160.

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, 56800 + ... + 67120.

Almost surely, 2^639489160 is an apocalyptic number.

It is an amenable number.

639489160 is an abundant number, since it is smaller than the sum of its proper divisors (800429840).

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

639489160 is a wasteful number, since it uses less digits than its factorization.

639489160 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11881 (or 11877 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 46.

The square root of 639489160 is about 25288.1229038456. The cubic root of 639489160 is about 861.5445292695.

The spelling of 639489160 in words is "six hundred thirty-nine million, four hundred eighty-nine thousand, one hundred sixty".