12561644 has 12 divisors (see below), whose sum is σ = 22020768. Its totient is φ = 6270000.

The previous prime is 12561599. The next prime is 12561671. The reversal of 12561644 is 44616521.

It is a super-3 number, since 3×12561644³ (a number of 22 digits) contains 333 as substring.

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, 269 + ... + 5019.

It is an arithmetic number, because the mean of its divisors is an integer number (1835064).

Almost surely, 2^12561644 is an apocalyptic number.

It is an amenable number.

12561644 is a deficient number, since it is larger than the sum of its proper divisors (9459124).

12561644 is a wasteful number, since it uses less digits than its factorization.

12561644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5416 (or 5414 counting only the distinct ones).

The product of its digits is 5760, while the sum is 29.

The square root of 12561644 is about 3544.2409624629. The cubic root of 12561644 is about 232.4603177352.

The spelling of 12561644 in words is "twelve million, five hundred sixty-one thousand, six hundred forty-four".