6686404 has 24 divisors (see below), whose sum is σ = 12457760. Its totient is φ = 3131136.

The previous prime is 6686363. The next prime is 6686413. The reversal of 6686404 is 4046866.

6686404 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 6686404.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6919 + ... + 7825.

Almost surely, 2^6686404 is an apocalyptic number.

It is an amenable number.

6686404 is a deficient number, since it is larger than the sum of its proper divisors (5771356).

6686404 is a wasteful number, since it uses less digits than its factorization.

6686404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1027 (or 1025 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 34.

The square root of 6686404 is about 2585.8081908757. The cubic root of 6686404 is about 188.3927581988.

The spelling of 6686404 in words is "six million, six hundred eighty-six thousand, four hundred four".