13680816 has 40 divisors (see below), whose sum is σ = 35478384. Its totient is φ = 4542720.

The previous prime is 13680809. The next prime is 13680829. The reversal of 13680816 is 61808631.

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, 19870 + ... + 20546.

Almost surely, 2^13680816 is an apocalyptic number.

13680816 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

13680816 is an abundant number, since it is smaller than the sum of its proper divisors (21797568).

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

13680816 is a wasteful number, since it uses less digits than its factorization.

13680816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1109 (or 1103 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 33.

The square root of 13680816 is about 3698.7587107028. The cubic root of 13680816 is about 239.1685114943.

The spelling of 13680816 in words is "thirteen million, six hundred eighty thousand, eight hundred sixteen".