18680816 has 80 divisors (see below), whose sum is σ = 46068480. Its totient is φ = 7127040.

The previous prime is 18680803. The next prime is 18680861. The reversal of 18680816 is 61808681.

It is a self number, because there is not a number n which added to its sum of digits gives 18680816.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 72560 + ... + 72816.

It is an arithmetic number, because the mean of its divisors is an integer number (575856).

Almost surely, 2^18680816 is an apocalyptic number.

18680816 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 18680816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23034240).

18680816 is an abundant number, since it is smaller than the sum of its proper divisors (27387664).

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

18680816 is a wasteful number, since it uses less digits than its factorization.

18680816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 342 (or 336 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 38.

The square root of 18680816 is about 4322.1309559059. The cubic root of 18680816 is about 265.3374886066.

The spelling of 18680816 in words is "eighteen million, six hundred eighty thousand, eight hundred sixteen".