6688422864 has 120 divisors (see below), whose sum is σ = 19941536160. Its totient is φ = 2086615296.

The previous prime is 6688422857. The next prime is 6688422893. The reversal of 6688422864 is 4682248866.

6688422864 is a `hidden beast` number, since 66 + 88 + 422 + 86 + 4 = 666.

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 6688422864.

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 23 ways as a sum of consecutive naturals, for example, 212362 + ... + 241814.

It is an arithmetic number, because the mean of its divisors is an integer number (166179468).

Almost surely, 2^6688422864 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 6688422864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9970768080).

6688422864 is an abundant number, since it is smaller than the sum of its proper divisors (13253113296).

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

6688422864 is a wasteful number, since it uses less digits than its factorization.

6688422864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29569 (or 29560 counting only the distinct ones).

The product of its digits is 7077888, while the sum is 54.

The square root of 6688422864 is about 81782.7785294679. The cubic root of 6688422864 is about 1884.1171712324.

The spelling of 6688422864 in words is "six billion, six hundred eighty-eight million, four hundred twenty-two thousand, eight hundred sixty-four".