12564643 has 32 divisors (see below), whose sum is σ = 16755200. Its totient is φ = 9199008.

The previous prime is 12564637. The next prime is 12564667. The reversal of 12564643 is 34646521.

It is not a de Polignac number, because 12564643 - 2¹⁷ = 12433571 is a prime.

Its product of digits (17280) is a multiple of the sum of its prime factors (108).

It is not an unprimeable number, because it can be changed into a prime (12564613) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 292180 + ... + 292222.

It is an arithmetic number, because the mean of its divisors is an integer number (523600).

Almost surely, 2^12564643 is an apocalyptic number.

12564643 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

12564643 is a deficient number, since it is larger than the sum of its proper divisors (4190557).

12564643 is an equidigital number, since it uses as much as digits as its factorization.

12564643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108 (or 82 counting only the distinct ones).

The product of its digits is 17280, while the sum is 31.

The square root of 12564643 is about 3544.6640179289. The cubic root of 12564643 is about 232.4788156595.

The spelling of 12564643 in words is "twelve million, five hundred sixty-four thousand, six hundred forty-three".