6645604 has 12 divisors (see below), whose sum is σ = 13291264. Its totient is φ = 2848104.

The previous prime is 6645601. The next prime is 6645619. The reversal of 6645604 is 4065466.

6645604 is an admirable number.

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (6645601) 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, 118644 + ... + 118699.

Almost surely, 2^6645604 is an apocalyptic number.

It is an amenable number.

6645604 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.

6645604 is a wasteful number, since it uses less digits than its factorization.

6645604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 237354 (or 237352 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 31.

The square root of 6645604 is about 2577.9069028962. The cubic root of 6645604 is about 188.0087893884.

The spelling of 6645604 in words is "six million, six hundred forty-five thousand, six hundred four".