639880363752 has 64 divisors (see below), whose sum is σ = 1828288859520. Its totient is φ = 182817036288.

The previous prime is 639880363673. The next prime is 639880363789. The reversal of 639880363752 is 257363088936.

It is a happy number.

It is a Smith number, since the sum of its digits (60) coincides with the sum of the digits of its prime factors.

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, 10266828 + ... + 10328964.

It is an arithmetic number, because the mean of its divisors is an integer number (28567013430).

Almost surely, 2^639880363752 is an apocalyptic number.

It is an amenable number.

639880363752 is an abundant number, since it is smaller than the sum of its proper divisors (1188408495768).

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

639880363752 is a wasteful number, since it uses less digits than its factorization.

639880363752 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123450 (or 123446 counting only the distinct ones).

The product of its (nonzero) digits is 39191040, while the sum is 60.

The spelling of 639880363752 in words is "six hundred thirty-nine billion, eight hundred eighty million, three hundred sixty-three thousand, seven hundred fifty-two".