639212104 has 16 divisors (see below), whose sum is σ = 1269024300. Its totient is φ = 300805632.

The previous prime is 639212089. The next prime is 639212141. The reversal of 639212104 is 401212936.

It can be written as a sum of positive squares in 2 ways, for example, as 629909604 + 9302500 = 25098^2 + 3050^2 .

It is a super-2 number, since 2×639212104² = 817184227800213632, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2349909 + ... + 2350180.

Almost surely, 2^639212104 is an apocalyptic number.

It is an amenable number.

639212104 is a deficient number, since it is larger than the sum of its proper divisors (629812196).

639212104 is a wasteful number, since it uses less digits than its factorization.

639212104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4700112 (or 4700108 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 639212104 is about 25282.6443237253. The cubic root of 639212104 is about 861.4200911108.

It can be divided in two parts, 6392 and 12104, that added together give a square (18496 = 136²).

The spelling of 639212104 in words is "six hundred thirty-nine million, two hundred twelve thousand, one hundred four".