639926496 has 72 divisors (see below), whose sum is σ = 1985236344. Its totient is φ = 193916160.

The previous prime is 639926491. The next prime is 639926501. The reversal of 639926496 is 694629936.

639926496 is a `hidden beast` number, since 63 + 9 + 92 + 6 + 496 = 666.

It is an interprime number because it is at equal distance from previous prime (639926491) and next prime (639926501).

It is a tau number, because it is divible by the number of its divisors (72).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639926491) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 97831 + ... + 104166.

It is an arithmetic number, because the mean of its divisors is an integer number (27572727).

Almost surely, 2^639926496 is an apocalyptic number.

639926496 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

639926496 is an abundant number, since it is smaller than the sum of its proper divisors (1345309848).

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

639926496 is a wasteful number, since it uses less digits than its factorization.

639926496 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 202024 (or 202013 counting only the distinct ones).

The product of its digits is 3779136, while the sum is 54.

The square root of 639926496 is about 25296.7684892755. The cubic root of 639926496 is about 861.7408831731.

The spelling of 639926496 in words is "six hundred thirty-nine million, nine hundred twenty-six thousand, four hundred ninety-six".