13687656 has 32 divisors (see below), whose sum is σ = 34313760. Its totient is φ = 4549952.

The previous prime is 13687649. The next prime is 13687693. The reversal of 13687656 is 65678631.

13687656 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

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, 13006 + ... + 14018.

It is an arithmetic number, because the mean of its divisors is an integer number (1072305).

Almost surely, 2^13687656 is an apocalyptic number.

It is an amenable number.

13687656 is an abundant number, since it is smaller than the sum of its proper divisors (20626104).

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

13687656 is a wasteful number, since it uses less digits than its factorization.

13687656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1585 (or 1581 counting only the distinct ones).

The product of its digits is 181440, while the sum is 42.

The square root of 13687656 is about 3699.6832296833. The cubic root of 13687656 is about 239.2083638944.

The spelling of 13687656 in words is "thirteen million, six hundred eighty-seven thousand, six hundred fifty-six".