12640556 has 24 divisors (see below), whose sum is σ = 22934016. Its totient is φ = 6092240.

The previous prime is 12640543. The next prime is 12640561. The reversal of 12640556 is 65504621.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12875 + ... + 13821.

It is an arithmetic number, because the mean of its divisors is an integer number (955584).

Almost surely, 2^12640556 is an apocalyptic number.

It is an amenable number.

12640556 is a deficient number, since it is larger than the sum of its proper divisors (10293460).

12640556 is a wasteful number, since it uses less digits than its factorization.

12640556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1069 (or 1067 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 12640556 is about 3555.3559596755. The cubic root of 12640556 is about 232.9460723617.

The spelling of 12640556 in words is "twelve million, six hundred forty thousand, five hundred fifty-six".