6646686 has 8 divisors (see below), whose sum is σ = 13293384. Its totient is φ = 2215560.

The previous prime is 6646669. The next prime is 6646687. The reversal of 6646686 is 6866466.

It is a sphenic number, since it is the product of 3 distinct primes.

6646686 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6646687) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 553885 + ... + 553896.

It is an arithmetic number, because the mean of its divisors is an integer number (1661673).

Almost surely, 2^6646686 is an apocalyptic number.

6646686 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

6646686 is a wasteful number, since it uses less digits than its factorization.

6646686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1107786.

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

The square root of 6646686 is about 2578.1167545323. The cubic root of 6646686 is about 188.0189923472.

The spelling of 6646686 in words is "six million, six hundred forty-six thousand, six hundred eighty-six".