639499160 has 16 divisors (see below), whose sum is σ = 1438873200. Its totient is φ = 255799648.

The previous prime is 639499141. The next prime is 639499243. The reversal of 639499160 is 61994936.

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 3 ways as a sum of consecutive naturals, for example, 7993700 + ... + 7993779.

It is an arithmetic number, because the mean of its divisors is an integer number (89929575).

Almost surely, 2^639499160 is an apocalyptic number.

It is an amenable number.

639499160 is an abundant number, since it is smaller than the sum of its proper divisors (799374040).

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

639499160 is a wasteful number, since it uses less digits than its factorization.

639499160 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15987490 (or 15987486 counting only the distinct ones).

The product of its (nonzero) digits is 314928, while the sum is 47.

The square root of 639499160 is about 25288.3206243515. The cubic root of 639499160 is about 861.5490200416.

The spelling of 639499160 in words is "six hundred thirty-nine million, four hundred ninety-nine thousand, one hundred sixty".