12564646 has 4 divisors (see below), whose sum is σ = 18846972. Its totient is φ = 6282322.

The previous prime is 12564637. The next prime is 12564667. The reversal of 12564646 is 64646521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 64646521 = 1283 ⋅50387.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3141160 + ... + 3141163.

It is an arithmetic number, because the mean of its divisors is an integer number (4711743).

Almost surely, 2^12564646 is an apocalyptic number.

12564646 is a deficient number, since it is larger than the sum of its proper divisors (6282326).

12564646 is an equidigital number, since it uses as much as digits as its factorization.

12564646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6282325.

The product of its digits is 34560, while the sum is 34.

The square root of 12564646 is about 3544.6644411002. The cubic root of 12564646 is about 232.4788341622.

The spelling of 12564646 in words is "twelve million, five hundred sixty-four thousand, six hundred forty-six".