12487644 has 36 divisors (see below), whose sum is σ = 33995416. Its totient is φ = 3842208.

The previous prime is 12487627. The next prime is 12487691. The reversal of 12487644 is 44678421.

12487644 is a `hidden beast` number, since 1 + 2 + 4 + 8 + 7 + 644 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 12487599 and 12487608.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12874 + ... + 13809.

Almost surely, 2^12487644 is an apocalyptic number.

It is an amenable number.

12487644 is an abundant number, since it is smaller than the sum of its proper divisors (21507772).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12487644 is a wasteful number, since it uses less digits than its factorization.

12487644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26706 (or 26701 counting only the distinct ones).

The product of its digits is 43008, while the sum is 36.

The square root of 12487644 is about 3533.7860716235. The cubic root of 12487644 is about 232.0029478421.

It can be divided in two parts, 12487 and 644, that added together give a palindrome (13131).

The spelling of 12487644 in words is "twelve million, four hundred eighty-seven thousand, six hundred forty-four".