6639604 has 12 divisors (see below), whose sum is σ = 11708928. Its totient is φ = 3294200.

The previous prime is 6639601. The next prime is 6639629. The reversal of 6639604 is 4069366.

It is a self number, because there is not a number n which added to its sum of digits gives 6639604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6639601) 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, 5812 + ... + 6859.

It is an arithmetic number, because the mean of its divisors is an integer number (975744).

Almost surely, 2^6639604 is an apocalyptic number.

It is an amenable number.

6639604 is a deficient number, since it is larger than the sum of its proper divisors (5069324).

6639604 is a wasteful number, since it uses less digits than its factorization.

6639604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12806 (or 12804 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 34.

The square root of 6639604 is about 2576.7429052973. The cubic root of 6639604 is about 187.9521909515.

The spelling of 6639604 in words is "six million, six hundred thirty-nine thousand, six hundred four".