639587079 has 6 divisors (see below), whose sum is σ = 923848016. Its totient is φ = 426391380.

The previous prime is 639587051. The next prime is 639587089. The reversal of 639587079 is 970785936.

639587079 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 639587079 - 2⁹ = 639586567 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639587089) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 35532607 + ... + 35532624.

Almost surely, 2^639587079 is an apocalyptic number.

639587079 is a deficient number, since it is larger than the sum of its proper divisors (284260937).

639587079 is a wasteful number, since it uses less digits than its factorization.

639587079 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71065237 (or 71065234 counting only the distinct ones).

The product of its (nonzero) digits is 2857680, while the sum is 54.

The square root of 639587079 is about 25290.0588967286. The cubic root of 639587079 is about 861.5885004466.

The spelling of 639587079 in words is "six hundred thirty-nine million, five hundred eighty-seven thousand, seventy-nine".