6645404 has 12 divisors (see below), whose sum is σ = 11648784. Its totient is φ = 3317184.

The previous prime is 6645391. The next prime is 6645461. The reversal of 6645404 is 4045466.

It is a super-2 number, since 2×6645404² = 88322788646432, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2612 + ... + 4484.

It is an arithmetic number, because the mean of its divisors is an integer number (970732).

Almost surely, 2^6645404 is an apocalyptic number.

It is an amenable number.

6645404 is a deficient number, since it is larger than the sum of its proper divisors (5003380).

6645404 is a wasteful number, since it uses less digits than its factorization.

6645404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2764 (or 2762 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 29.

The square root of 6645404 is about 2577.8681114440. The cubic root of 6645404 is about 188.0069033228.

The spelling of 6645404 in words is "six million, six hundred forty-five thousand, four hundred four".