639479358 has 24 divisors (see below), whose sum is σ = 1583473008. Its totient is φ = 182708352.

The previous prime is 639479339. The next prime is 639479383. The reversal of 639479358 is 853974936.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2537491 + ... + 2537742.

It is an arithmetic number, because the mean of its divisors is an integer number (65978042).

Almost surely, 2^639479358 is an apocalyptic number.

639479358 is an abundant number, since it is smaller than the sum of its proper divisors (943993650).

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

639479358 is a wasteful number, since it uses less digits than its factorization.

639479358 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5075248 (or 5075245 counting only the distinct ones).

The product of its digits is 4898880, while the sum is 54.

The square root of 639479358 is about 25287.9290967054. The cubic root of 639479358 is about 861.5401273691.

The spelling of 639479358 in words is "six hundred thirty-nine million, four hundred seventy-nine thousand, three hundred fifty-eight".