639852912 has 80 divisors (see below), whose sum is σ = 1866800160. Its totient is φ = 209779200.

The previous prime is 639852907. The next prime is 639852937. The reversal of 639852912 is 219258936.

639852912 is a `hidden beast` number, since 639 + 8 + 5 + 2 + 9 + 1 + 2 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14212 + ... + 38492.

It is an arithmetic number, because the mean of its divisors is an integer number (23335002).

Almost surely, 2^639852912 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 639852912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (933400080).

639852912 is an abundant number, since it is smaller than the sum of its proper divisors (1226947248).

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

639852912 is a wasteful number, since it uses less digits than its factorization.

639852912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24359 (or 24347 counting only the distinct ones).

The product of its digits is 233280, while the sum is 45.

The square root of 639852912 is about 25295.3140324448. The cubic root of 639852912 is about 861.7078518941.

The spelling of 639852912 in words is "six hundred thirty-nine million, eight hundred fifty-two thousand, nine hundred twelve".