6686646 has 32 divisors (see below), whose sum is σ = 14031360. Its totient is φ = 2121504.

The previous prime is 6686611. The next prime is 6686653. The reversal of 6686646 is 6466866.

It is a super-2 number, since 2×6686646² = 89422469458632, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 6686598 and 6686607.

It is a congruent number.

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, 14211 + ... + 14673.

It is an arithmetic number, because the mean of its divisors is an integer number (438480).

Almost surely, 2^6686646 is an apocalyptic number.

6686646 is an abundant number, since it is smaller than the sum of its proper divisors (7344714).

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

6686646 is a wasteful number, since it uses less digits than its factorization.

6686646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 580.

The product of its digits is 248832, while the sum is 42.

The square root of 6686646 is about 2585.8549843330. The cubic root of 6686646 is about 188.3950309948.

The spelling of 6686646 in words is "six million, six hundred eighty-six thousand, six hundred forty-six".