12816644 has 12 divisors (see below), whose sum is σ = 22713600. Its totient is φ = 6327048.

The previous prime is 12816607. The next prime is 12816667. The reversal of 12816644 is 44661821.

It is a self number, because there is not a number n which added to its sum of digits gives 12816644.

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, 19964 + ... + 20595.

It is an arithmetic number, because the mean of its divisors is an integer number (1892800).

Almost surely, 2^12816644 is an apocalyptic number.

It is an amenable number.

12816644 is a deficient number, since it is larger than the sum of its proper divisors (9896956).

12816644 is a wasteful number, since it uses less digits than its factorization.

12816644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40642 (or 40640 counting only the distinct ones).

The product of its digits is 9216, while the sum is 32.

The square root of 12816644 is about 3580.0340780501. The cubic root of 12816644 is about 234.0227654575.

The spelling of 12816644 in words is "twelve million, eight hundred sixteen thousand, six hundred forty-four".