18087680 has 72 divisors (see below), whose sum is σ = 46701312. Its totient is φ = 6672384.

The previous prime is 18087679. The next prime is 18087691. The reversal of 18087680 is 8678081.

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, 16097 + ... + 17183.

Almost surely, 2^18087680 is an apocalyptic number.

18087680 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 18087680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23350656).

18087680 is an abundant number, since it is smaller than the sum of its proper divisors (28613632).

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

18087680 is a wasteful number, since it uses less digits than its factorization.

18087680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1121 (or 1107 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 38.

The square root of 18087680 is about 4252.9613212443. The cubic root of 18087680 is about 262.4989810996.

The spelling of 18087680 in words is "eighteen million, eighty-seven thousand, six hundred eighty".