639882066 has 16 divisors (see below), whose sum is σ = 1292436288. Its totient is φ = 211182000.

The previous prime is 639882059. The next prime is 639882073. The reversal of 639882066 is 660288936.

It is an interprime number because it is at equal distance from previous prime (639882059) and next prime (639882073).

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, 527350 + ... + 528561.

It is an arithmetic number, because the mean of its divisors is an integer number (80777268).

Almost surely, 2^639882066 is an apocalyptic number.

639882066 is an abundant number, since it is smaller than the sum of its proper divisors (652554222).

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

639882066 is a wasteful number, since it uses less digits than its factorization.

639882066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1056017.

The product of its (nonzero) digits is 746496, while the sum is 48.

The square root of 639882066 is about 25295.8902986236. The cubic root of 639882066 is about 861.7209391984.

The spelling of 639882066 in words is "six hundred thirty-nine million, eight hundred eighty-two thousand, sixty-six".