12778564 has 24 divisors (see below), whose sum is σ = 23663360. Its totient is φ = 6021216.

The previous prime is 12778561. The next prime is 12778627. The reversal of 12778564 is 46587721.

It is not an unprimeable number, because it can be changed into a prime (12778561) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 20749 + ... + 21355.

Almost surely, 2^12778564 is an apocalyptic number.

It is an amenable number.

12778564 is a deficient number, since it is larger than the sum of its proper divisors (10884796).

12778564 is a wasteful number, since it uses less digits than its factorization.

12778564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 907 (or 905 counting only the distinct ones).

The product of its digits is 94080, while the sum is 40.

The square root of 12778564 is about 3574.7117366300. The cubic root of 12778564 is about 233.7907643358.

The spelling of 12778564 in words is "twelve million, seven hundred seventy-eight thousand, five hundred sixty-four".