13581656 has 32 divisors (see below), whose sum is σ = 29246400. Its totient is φ = 5847840.

The previous prime is 13581643. The next prime is 13581671. The reversal of 13581656 is 65618531.

It is a super-2 number, since 2×13581656² = 368922759404672, which contains 22 as substring.

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, 2390 + ... + 5733.

It is an arithmetic number, because the mean of its divisors is an integer number (913950).

Almost surely, 2^13581656 is an apocalyptic number.

It is an amenable number.

13581656 is an abundant number, since it is smaller than the sum of its proper divisors (15664744).

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

13581656 is a wasteful number, since it uses less digits than its factorization.

13581656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8159 (or 8155 counting only the distinct ones).

The product of its digits is 21600, while the sum is 35.

The square root of 13581656 is about 3685.3298359848. The cubic root of 13581656 is about 238.5892702167.

The spelling of 13581656 in words is "thirteen million, five hundred eighty-one thousand, six hundred fifty-six".