13215656 has 32 divisors (see below), whose sum is σ = 25660800. Its totient is φ = 6377280.

The previous prime is 13215617. The next prime is 13215661. The reversal of 13215656 is 65651231.

13215656 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 29885 + ... + 30323.

It is an arithmetic number, because the mean of its divisors is an integer number (801900).

Almost surely, 2^13215656 is an apocalyptic number.

It is an amenable number.

13215656 is a deficient number, since it is larger than the sum of its proper divisors (12445144).

13215656 is a wasteful number, since it uses less digits than its factorization.

13215656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 569 (or 565 counting only the distinct ones).

The product of its digits is 5400, while the sum is 29.

The square root of 13215656 is about 3635.3343725165. The cubic root of 13215656 is about 236.4265483243.

Adding to 13215656 its reverse (65651231), we get a palindrome (78866887).

The spelling of 13215656 in words is "thirteen million, two hundred fifteen thousand, six hundred fifty-six".