12644 has 12 divisors (see below), whose sum is σ = 23100.
Its totient is φ = 6048.
The previous prime is 12641. The next prime is 12647. The reversal of 12644 is 44621.
It can be divided in two parts, 12 and 644, that added together give a palindrome (656).
It is an interprime number because it is at equal distance from previous prime (12641) and next prime (12647).
It can be written as a sum of positive squares in 2 ways, for example, as 7744 + 4900 = 88^2 + 70^2
It is a nialpdrome in base 11.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (12641) by changing a digit.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 62 + ... + 170.
It is an arithmetic number, because the mean of its divisors is an integer number (1925).
212644 is an apocalyptic number.
It is an amenable number.
12644 is a deficient number, since it is larger than the sum of its proper divisors (10456).
12644 is a wasteful number, since it uses less digits than its factorization.
12644 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 142 (or 140 counting only the distinct ones).
The product of its digits is 192, while the sum is 17.
The square root of 12644 is about 112.4455423750.
The cubic root of 12644 is about 23.2967226321.
The spelling of 12644 in words is "twelve thousand, six hundred forty-four".