12644863 has 12 divisors (see below), whose sum is σ = 15885520. Its totient is φ = 9852480.

The previous prime is 12644857. The next prime is 12644867. The reversal of 12644863 is 36844621.

It is not a de Polignac number, because 12644863 - 2⁵ = 12644831 is a prime.

It is a super-3 number, since 3×12644863³ (a number of 22 digits) contains 333 as substring.

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12644867) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6618 + ... + 8311.

Almost surely, 2^12644863 is an apocalyptic number.

12644863 is a deficient number, since it is larger than the sum of its proper divisors (3240657).

12644863 is a wasteful number, since it uses less digits than its factorization.

12644863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14958 (or 14947 counting only the distinct ones).

The product of its digits is 27648, while the sum is 34.

The square root of 12644863 is about 3555.9616139660. The cubic root of 12644863 is about 232.9725264935.

The spelling of 12644863 in words is "twelve million, six hundred forty-four thousand, eight hundred sixty-three".