639327885 has 32 divisors (see below), whose sum is σ = 1188233472. Its totient is φ = 287470080.

The previous prime is 639327877. The next prime is 639327907. The reversal of 639327885 is 588723936.

It is not a de Polignac number, because 639327885 - 2³ = 639327877 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 43504 + ... + 56313.

It is an arithmetic number, because the mean of its divisors is an integer number (37132296).

Almost surely, 2^639327885 is an apocalyptic number.

It is an amenable number.

639327885 is a deficient number, since it is larger than the sum of its proper divisors (548905587).

639327885 is a wasteful number, since it uses less digits than its factorization.

639327885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99893.

The product of its digits is 2177280, while the sum is 51.

The square root of 639327885 is about 25284.9339528503. The cubic root of 639327885 is about 861.4720978744.

It can be divided in two parts, 63932 and 7885, that added together give a palindrome (71817).

The spelling of 639327885 in words is "six hundred thirty-nine million, three hundred twenty-seven thousand, eight hundred eighty-five".