12861564 has 24 divisors (see below), whose sum is σ = 30288720. Its totient is φ = 4247424.

The previous prime is 12861557. The next prime is 12861581. The reversal of 12861564 is 46516821.

It is a congruent number.

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, 3609 + ... + 6224.

It is an arithmetic number, because the mean of its divisors is an integer number (1262030).

Almost surely, 2^12861564 is an apocalyptic number.

It is an amenable number.

12861564 is an abundant number, since it is smaller than the sum of its proper divisors (17427156).

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

12861564 is a wasteful number, since it uses less digits than its factorization.

12861564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9949 (or 9947 counting only the distinct ones).

The product of its digits is 11520, while the sum is 33.

The square root of 12861564 is about 3586.3022739306. The cubic root of 12861564 is about 234.2958490418.

It can be divided in two parts, 1286 and 1564, that added together give a triangular number (2850 = T₇₅).

The spelling of 12861564 in words is "twelve million, eight hundred sixty-one thousand, five hundred sixty-four".