6656688 has 80 divisors (see below), whose sum is σ = 20137600. Its totient is φ = 2099520.

The previous prime is 6656659. The next prime is 6656711. The reversal of 6656688 is 8866566.

6656688 is a `hidden beast` number, since 6 + 6 + 566 + 88 = 666.

It is a super-2 number, since 2×6656688² = 88622990258688, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7803 + ... + 8613.

It is an arithmetic number, because the mean of its divisors is an integer number (251720).

Almost surely, 2^6656688 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 6656688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10068800).

6656688 is an abundant number, since it is smaller than the sum of its proper divisors (13480912).

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

6656688 is a wasteful number, since it uses less digits than its factorization.

6656688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 847 (or 835 counting only the distinct ones).

The product of its digits is 414720, while the sum is 45.

The square root of 6656688 is about 2580.0558133498. The cubic root of 6656688 is about 188.1132560374.

The spelling of 6656688 in words is "six million, six hundred fifty-six thousand, six hundred eighty-eight".