6642688 has 44 divisors (see below), whose sum is σ = 14329000. Its totient is φ = 3059712.

The previous prime is 6642659. The next prime is 6642707. The reversal of 6642688 is 8862466.

It is a self number, because there is not a number n which added to its sum of digits gives 6642688.

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, 13063 + ... + 13561.

Almost surely, 2^6642688 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 6642688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7164500).

6642688 is an abundant number, since it is smaller than the sum of its proper divisors (7686312).

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

6642688 is a wasteful number, since it uses less digits than its factorization.

6642688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 532 (or 514 counting only the distinct ones).

The product of its digits is 110592, while the sum is 40.

The square root of 6642688 is about 2577.3412657233. The cubic root of 6642688 is about 187.9812868050.

The spelling of 6642688 in words is "six million, six hundred forty-two thousand, six hundred eighty-eight".