6640684 has 12 divisors (see below), whose sum is σ = 11642400. Its totient is φ = 3314288.

The previous prime is 6640679. The next prime is 6640687. The reversal of 6640684 is 4860466.

It is not an unprimeable number, because it can be changed into a prime (6640687) 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, 1722 + ... + 4030.

It is an arithmetic number, because the mean of its divisors is an integer number (970200).

Almost surely, 2^6640684 is an apocalyptic number.

It is an amenable number.

6640684 is a deficient number, since it is larger than the sum of its proper divisors (5001716).

6640684 is a wasteful number, since it uses less digits than its factorization.

6640684 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3032 (or 3030 counting only the distinct ones).

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

The square root of 6640684 is about 2576.9524636671. The cubic root of 6640684 is about 187.9623811858.

The spelling of 6640684 in words is "six million, six hundred forty thousand, six hundred eighty-four".