6689668 has 12 divisors (see below), whose sum is σ = 11753280. Its totient is φ = 3331592.

The previous prime is 6689659. The next prime is 6689681. The reversal of 6689668 is 8669866.

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, 2128 + ... + 4231.

It is an arithmetic number, because the mean of its divisors is an integer number (979440).

Almost surely, 2^6689668 is an apocalyptic number.

It is an amenable number.

6689668 is a deficient number, since it is larger than the sum of its proper divisors (5063612).

6689668 is a wasteful number, since it uses less digits than its factorization.

6689668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6626 (or 6624 counting only the distinct ones).

The product of its digits is 746496, while the sum is 49.

The square root of 6689668 is about 2586.4392511714. The cubic root of 6689668 is about 188.4234081532.

The spelling of 6689668 in words is "six million, six hundred eighty-nine thousand, six hundred sixty-eight".