6639363808 has 96 divisors (see below), whose sum is σ = 16387757568. Its totient is φ = 2572300800.

The previous prime is 6639363779. The next prime is 6639363811. The reversal of 6639363808 is 8083639366.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 438541 + ... + 453427.

It is an arithmetic number, because the mean of its divisors is an integer number (170705808).

Almost surely, 2^6639363808 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6639363808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8193878784).

6639363808 is an abundant number, since it is smaller than the sum of its proper divisors (9748393760).

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

6639363808 is a wasteful number, since it uses less digits than its factorization.

6639363808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15096 (or 15088 counting only the distinct ones).

The product of its (nonzero) digits is 3359232, while the sum is 52.

The square root of 6639363808 is about 81482.2913767157. The cubic root of 6639363808 is about 1879.4992449321.

The spelling of 6639363808 in words is "six billion, six hundred thirty-nine million, three hundred sixty-three thousand, eight hundred eight".