6688688 has 10 divisors (see below), whose sum is σ = 12959364. Its totient is φ = 3344336.

The previous prime is 6688673. The next prime is 6688691. The reversal of 6688688 is 8868866.

It is a super-2 number, since 2×6688688² = 89477094322688, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 209006 + ... + 209037.

Almost surely, 2^6688688 is an apocalyptic number.

It is an amenable number.

6688688 is a deficient number, since it is larger than the sum of its proper divisors (6270676).

6688688 is a wasteful number, since it uses less digits than its factorization.

6688688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 418051 (or 418045 counting only the distinct ones).

The product of its digits is 884736, while the sum is 50.

The square root of 6688688 is about 2586.2497945867. The cubic root of 6688688 is about 188.4142067021.

The spelling of 6688688 in words is "six million, six hundred eighty-eight thousand, six hundred eighty-eight".