639538002 has 24 divisors (see below), whose sum is σ = 1393413840. Its totient is φ = 211987320.

The previous prime is 639537973. The next prime is 639538033. The reversal of 639538002 is 200835936.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 96024 + ... + 102467.

It is an arithmetic number, because the mean of its divisors is an integer number (58058910).

Almost surely, 2^639538002 is an apocalyptic number.

639538002 is an abundant number, since it is smaller than the sum of its proper divisors (753875838).

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

639538002 is a wasteful number, since it uses less digits than its factorization.

639538002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198678 (or 198675 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 36.

The square root of 639538002 is about 25289.0885956770. The cubic root of 639538002 is about 861.5664626549.

The spelling of 639538002 in words is "six hundred thirty-nine million, five hundred thirty-eight thousand, two".