13620540564 has 36 divisors (see below), whose sum is σ = 36241791040. Its totient is φ = 4301223120.

The previous prime is 13620540559. The next prime is 13620540581. The reversal of 13620540564 is 46504502631.

13620540564 is a `hidden beast` number, since 1 + 3 + 62 + 0 + 540 + 56 + 4 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9955852 + ... + 9957219.

Almost surely, 2^13620540564 is an apocalyptic number.

It is an amenable number.

13620540564 is an abundant number, since it is smaller than the sum of its proper divisors (22621250476).

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

13620540564 is a wasteful number, since it uses less digits than its factorization.

13620540564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19913100 (or 19913095 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 36.

The spelling of 13620540564 in words is "thirteen billion, six hundred twenty million, five hundred forty thousand, five hundred sixty-four".