12644540 has 12 divisors (see below), whose sum is σ = 26553576. Its totient is φ = 5057808.

The previous prime is 12644483. The next prime is 12644561. The reversal of 12644540 is 4544621.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 316094 + ... + 316133.

It is an arithmetic number, because the mean of its divisors is an integer number (2212798).

Almost surely, 2^12644540 is an apocalyptic number.

12644540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12644540 is an abundant number, since it is smaller than the sum of its proper divisors (13909036).

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

12644540 is a wasteful number, since it uses less digits than its factorization.

12644540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 632236 (or 632234 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 26.

The square root of 12644540 is about 3555.9161969878. The cubic root of 12644540 is about 232.9705427956.

The spelling of 12644540 in words is "twelve million, six hundred forty-four thousand, five hundred forty".