12661604 has 12 divisors (see below), whose sum is σ = 22386924. Its totient is φ = 6265344.

The previous prime is 12661591. The next prime is 12661613. The reversal of 12661604 is 40616621.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 7279204 + 5382400 = 2698^2 + 2320^2 .

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, 15929 + ... + 16704.

It is an arithmetic number, because the mean of its divisors is an integer number (1865577).

Almost surely, 2^12661604 is an apocalyptic number.

It is an amenable number.

12661604 is a deficient number, since it is larger than the sum of its proper divisors (9725320).

12661604 is a wasteful number, since it uses less digits than its factorization.

12661604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32734 (or 32732 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 12661604 is about 3558.3147696627. The cubic root of 12661604 is about 233.0752947910.

The spelling of 12661604 in words is "twelve million, six hundred sixty-one thousand, six hundred four".