18055680 has 80 divisors (see below), whose sum is σ = 57746304. Its totient is φ = 4812800.

The previous prime is 18055679. The next prime is 18055693. The reversal of 18055680 is 8655081.

It is a tau number, because it is divible by the number of its divisors (80).

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, 6505 + ... + 8855.

Almost surely, 2^18055680 is an apocalyptic number.

18055680 is a gapful number since it is divisible by the number (10) 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 18055680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28873152).

18055680 is an abundant number, since it is smaller than the sum of its proper divisors (39690624).

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

18055680 is an equidigital number, since it uses as much as digits as its factorization.

18055680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2377 (or 2361 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 33.

The square root of 18055680 is about 4249.1975713068. The cubic root of 18055680 is about 262.3440888212.

The spelling of 18055680 in words is "eighteen million, fifty-five thousand, six hundred eighty".