6639038624 has 24 divisors (see below), whose sum is σ = 13126719060. Its totient is φ = 3305268736.

The previous prime is 6639038617. The next prime is 6639038669. The reversal of 6639038624 is 4268309366.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 5088254224 + 1550784400 = 71332^2 + 39380^2 .

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, 437759 + ... + 452670.

Almost surely, 2^6639038624 is an apocalyptic number.

It is an amenable number.

6639038624 is a deficient number, since it is larger than the sum of its proper divisors (6487680436).

6639038624 is a wasteful number, since it uses less digits than its factorization.

6639038624 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 890672 (or 890664 counting only the distinct ones).

The product of its (nonzero) digits is 1119744, while the sum is 47.

The square root of 6639038624 is about 81480.2959248431. The cubic root of 6639038624 is about 1879.4685596095.

The spelling of 6639038624 in words is "six billion, six hundred thirty-nine million, thirty-eight thousand, six hundred twenty-four".