13720564 has 72 divisors (see below), whose sum is σ = 30326688. Its totient is φ = 5352960.

The previous prime is 13720543. The next prime is 13720589. The reversal of 13720564 is 46502731.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 165267 + ... + 165349.

It is an arithmetic number, because the mean of its divisors is an integer number (421204).

Almost surely, 2^13720564 is an apocalyptic number.

It is an amenable number.

13720564 is an abundant number, since it is smaller than the sum of its proper divisors (16606124).

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

13720564 is a wasteful number, since it uses less digits than its factorization.

13720564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145 (or 126 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 28.

The square root of 13720564 is about 3704.1279675519. The cubic root of 13720564 is about 239.3999128518.

The spelling of 13720564 in words is "thirteen million, seven hundred twenty thousand, five hundred sixty-four".