13620656 has 40 divisors (see below), whose sum is σ = 31140864. Its totient is φ = 5647680.

The previous prime is 13620641. The next prime is 13620667. The reversal of 13620656 is 65602631.

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, 1511 + ... + 5433.

Almost surely, 2^13620656 is an apocalyptic number.

13620656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 13620656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15570432).

13620656 is an abundant number, since it is smaller than the sum of its proper divisors (17520208).

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

13620656 is a wasteful number, since it uses less digits than its factorization.

13620656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3969 (or 3963 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 29.

The square root of 13620656 is about 3690.6172925406. The cubic root of 13620656 is about 238.8174232794.

The spelling of 13620656 in words is "thirteen million, six hundred twenty thousand, six hundred fifty-six".