6639072208 has 20 divisors (see below), whose sum is σ = 13210857700. Its totient is φ = 3229818624.

The previous prime is 6639072191. The next prime is 6639072221. The reversal of 6639072208 is 8022709366.

It can be written as a sum of positive squares in 2 ways, for example, as 6270739344 + 368332864 = 79188^2 + 19192^2 .

It is a congruent number.

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, 5606733 + ... + 5607916.

It is an arithmetic number, because the mean of its divisors is an integer number (660542885).

Almost surely, 2^6639072208 is an apocalyptic number.

It is an amenable number.

6639072208 is a deficient number, since it is larger than the sum of its proper divisors (6571785492).

6639072208 is a wasteful number, since it uses less digits than its factorization.

6639072208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11214694 (or 11214688 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 43.

The square root of 6639072208 is about 81480.5020112174. The cubic root of 6639072208 is about 1879.4717287413.

The spelling of 6639072208 in words is "six billion, six hundred thirty-nine million, seventy-two thousand, two hundred eight".