639000108 has 18 divisors (see below), whose sum is σ = 1615250364. Its totient is φ = 213000024.

The previous prime is 639000083. The next prime is 639000113. The reversal of 639000108 is 801000936.

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×639000108² = 816642276048023328, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8874966 + ... + 8875037.

Almost surely, 2^639000108 is an apocalyptic number.

It is an amenable number.

639000108 is an abundant number, since it is smaller than the sum of its proper divisors (976250256).

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

639000108 is a wasteful number, since it uses less digits than its factorization.

639000108 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17750013 (or 17750008 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 639000108 is about 25278.4514557360. The cubic root of 639000108 is about 861.3248500034.

The spelling of 639000108 in words is "six hundred thirty-nine million, one hundred eight", and thus it is an aban number.