639789168 has 20 divisors (see below), whose sum is σ = 1652788808. Its totient is φ = 213263040.

The previous prime is 639789113. The next prime is 639789173. The reversal of 639789168 is 861987936.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6664423 + ... + 6664518.

Almost surely, 2^639789168 is an apocalyptic number.

It is an amenable number.

639789168 is an abundant number, since it is smaller than the sum of its proper divisors (1012999640).

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

639789168 is a wasteful number, since it uses less digits than its factorization.

639789168 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13328952 (or 13328946 counting only the distinct ones).

The product of its digits is 3919104, while the sum is 57.

The square root of 639789168 is about 25294.0540048447. The cubic root of 639789168 is about 861.6792356667.

The spelling of 639789168 in words is "six hundred thirty-nine million, seven hundred eighty-nine thousand, one hundred sixty-eight".