12564978 has 16 divisors (see below), whose sum is σ = 25809600. Its totient is φ = 4075056.

The previous prime is 12564977. The next prime is 12565009. The reversal of 12564978 is 87946521.

It is not an unprimeable number, because it can be changed into a prime (12564971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28078 + ... + 28521.

It is an arithmetic number, because the mean of its divisors is an integer number (1613100).

Almost surely, 2^12564978 is an apocalyptic number.

12564978 is an abundant number, since it is smaller than the sum of its proper divisors (13244622).

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

12564978 is a wasteful number, since it uses less digits than its factorization.

12564978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56641.

The product of its digits is 120960, while the sum is 42.

The square root of 12564978 is about 3544.7112717399. The cubic root of 12564978 is about 232.4808817671.

The spelling of 12564978 in words is "twelve million, five hundred sixty-four thousand, nine hundred seventy-eight".