6639790320 has 280 divisors, whose sum is σ = 23288192496. Its totient is φ = 1759739904.

The previous prime is 6639790319. The next prime is 6639790349. The reversal of 6639790320 is 230979366.

6639790320 is a `hidden beast` number, since 6 + 639 + 7 + 9 + 0 + 3 + 2 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 14988019 + ... + 14988461.

Almost surely, 2^6639790320 is an apocalyptic number.

6639790320 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6639790320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11644096248).

6639790320 is an abundant number, since it is smaller than the sum of its proper divisors (16648402176).

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

6639790320 is a wasteful number, since it uses less digits than its factorization.

6639790320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 731 (or 710 counting only the distinct ones).

The product of its (nonzero) digits is 367416, while the sum is 45.

The square root of 6639790320 is about 81484.9085413980. The cubic root of 6639790320 is about 1879.5394903452.

The spelling of 6639790320 in words is "six billion, six hundred thirty-nine million, seven hundred ninety thousand, three hundred twenty".