639795108 has 24 divisors (see below), whose sum is σ = 1527574048. Its totient is φ = 208305216.

The previous prime is 639795097. The next prime is 639795173. The reversal of 639795108 is 801597936.

639795108 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 619441 + ... + 620472.

Almost surely, 2^639795108 is an apocalyptic number.

It is an amenable number.

639795108 is an abundant number, since it is smaller than the sum of its proper divisors (887778940).

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

639795108 is a wasteful number, since it uses less digits than its factorization.

639795108 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1239963 (or 1239961 counting only the distinct ones).

The product of its (nonzero) digits is 408240, while the sum is 48.

The square root of 639795108 is about 25294.1714234722. The cubic root of 639795108 is about 861.6819023570.

The spelling of 639795108 in words is "six hundred thirty-nine million, seven hundred ninety-five thousand, one hundred eight".