12812644 has 24 divisors (see below), whose sum is σ = 24607800. Its totient is φ = 5800704.

The previous prime is 12812629. The next prime is 12812647. The reversal of 12812644 is 44621821.

It can be written as a sum of positive squares in 4 ways, for example, as 4460544 + 8352100 = 2112^2 + 2890^2 .

It is not an unprimeable number, because it can be changed into a prime (12812647) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 432 + ... + 5080.

It is an arithmetic number, because the mean of its divisors is an integer number (1025325).

Almost surely, 2^12812644 is an apocalyptic number.

It is an amenable number.

12812644 is a deficient number, since it is larger than the sum of its proper divisors (11795156).

12812644 is a wasteful number, since it uses less digits than its factorization.

12812644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4719 (or 4717 counting only the distinct ones).

The product of its digits is 3072, while the sum is 28.

The square root of 12812644 is about 3579.4753805551. The cubic root of 12812644 is about 233.9984172099.

It can be divided in two parts, 12812 and 644, that added together give a square (13456 = 116²).

The spelling of 12812644 in words is "twelve million, eight hundred twelve thousand, six hundred forty-four".