12644816 has 20 divisors (see below), whose sum is σ = 24846624. Its totient is φ = 6232800.

The previous prime is 12644809. The next prime is 12644831. The reversal of 12644816 is 61844621.

12644816 is an esthetic number in base 7, because in such base its adjacent digits differ by 1.

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, 4430 + ... + 6701.

Almost surely, 2^12644816 is an apocalyptic number.

12644816 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

12644816 is a deficient number, since it is larger than the sum of its proper divisors (12201808).

12644816 is a wasteful number, since it uses less digits than its factorization.

12644816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11210 (or 11204 counting only the distinct ones).

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

The square root of 12644816 is about 3555.9550053396. The cubic root of 12644816 is about 232.9722378461.

The spelling of 12644816 in words is "twelve million, six hundred forty-four thousand, eight hundred sixteen".