639346980 has 48 divisors (see below), whose sum is σ = 1791336960. Its totient is φ = 170381568.

The previous prime is 639346957. The next prime is 639346993. The reversal of 639346980 is 89643936.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 135501 + ... + 140139.

It is an arithmetic number, because the mean of its divisors is an integer number (37319520).

Almost surely, 2^639346980 is an apocalyptic number.

639346980 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

639346980 is an abundant number, since it is smaller than the sum of its proper divisors (1151989980).

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

639346980 is a wasteful number, since it uses less digits than its factorization.

639346980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6948 (or 6946 counting only the distinct ones).

The product of its (nonzero) digits is 839808, while the sum is 48.

The square root of 639346980 is about 25285.3115464295. The cubic root of 639346980 is about 861.4806744052.

The spelling of 639346980 in words is "six hundred thirty-nine million, three hundred forty-six thousand, nine hundred eighty".