12644769 has 16 divisors (see below), whose sum is σ = 17385984. Its totient is φ = 8169600.

The previous prime is 12644767. The next prime is 12644789. The reversal of 12644769 is 96744621.

It is a happy number.

12644769 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12644769 - 2¹ = 12644767 is a prime.

It is a super-2 number, since 2×12644769² = 319780366126722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12644761) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27199 + ... + 27659.

It is an arithmetic number, because the mean of its divisors is an integer number (1086624).

Almost surely, 2^12644769 is an apocalyptic number.

It is an amenable number.

12644769 is a deficient number, since it is larger than the sum of its proper divisors (4741215).

12644769 is a wasteful number, since it uses less digits than its factorization.

12644769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 728.

The product of its digits is 72576, while the sum is 39.

The square root of 12644769 is about 3555.9483967009. The cubic root of 12644769 is about 232.9719491979.

The spelling of 12644769 in words is "twelve million, six hundred forty-four thousand, seven hundred sixty-nine".