639280790 has 16 divisors (see below), whose sum is σ = 1155869568. Its totient is φ = 254564736.

The previous prime is 639280757. The next prime is 639280823. The reversal of 639280790 is 97082936.

It is an interprime number because it is at equal distance from previous prime (639280757) and next prime (639280823).

It is a congruent number.

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, 141107 + ... + 145566.

It is an arithmetic number, because the mean of its divisors is an integer number (72241848).

Almost surely, 2^639280790 is an apocalyptic number.

639280790 is a deficient number, since it is larger than the sum of its proper divisors (516588778).

639280790 is a wasteful number, since it uses less digits than its factorization.

639280790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 286903.

The product of its (nonzero) digits is 163296, while the sum is 44.

The square root of 639280790 is about 25284.0026498970. The cubic root of 639280790 is about 861.4509443966.

The spelling of 639280790 in words is "six hundred thirty-nine million, two hundred eighty thousand, seven hundred ninety".