6660688 has 20 divisors (see below), whose sum is σ = 12959488. Its totient is φ = 3316320.

The previous prime is 6660679. The next prime is 6660707. The reversal of 6660688 is 8860666.

It is a self number, because there is not a number n which added to its sum of digits gives 6660688.

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, 3793 + ... + 5263.

Almost surely, 2^6660688 is an apocalyptic number.

It is an amenable number.

6660688 is a deficient number, since it is larger than the sum of its proper divisors (6298800).

6660688 is a wasteful number, since it uses less digits than its factorization.

6660688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1762 (or 1756 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 40.

The square root of 6660688 is about 2580.8308739629. The cubic root of 6660688 is about 188.1509275420.

The spelling of 6660688 in words is "six million, six hundred sixty thousand, six hundred eighty-eight".