13561664 has 28 divisors (see below), whose sum is σ = 27037284. Its totient is φ = 6749184.

The previous prime is 13561657. The next prime is 13561679. The reversal of 13561664 is 46616531.

It can be written as a sum of positive squares in 2 ways, for example, as 6801664 + 6760000 = 2608^2 + 2600^2 .

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a self number, because there is not a number n which added to its sum of digits gives 13561664.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19694 + ... + 20370.

Almost surely, 2^13561664 is an apocalyptic number.

It is an amenable number.

13561664 is a deficient number, since it is larger than the sum of its proper divisors (13475620).

13561664 is an equidigital number, since it uses as much as digits as its factorization.

13561664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1002 (or 992 counting only the distinct ones).

The product of its digits is 12960, while the sum is 32.

The square root of 13561664 is about 3682.6164611591. The cubic root of 13561664 is about 238.4721460849.

The spelling of 13561664 in words is "thirteen million, five hundred sixty-one thousand, six hundred sixty-four".