18102720 has 112 divisors (see below), whose sum is σ = 58338720. Its totient is φ = 4755456.

The previous prime is 18102709. The next prime is 18102727. The reversal of 18102720 is 2720181.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18102727) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 104554 + ... + 104726.

Almost surely, 2^18102720 is an apocalyptic number.

18102720 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 18102720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29169360).

18102720 is an abundant number, since it is smaller than the sum of its proper divisors (40236000).

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

18102720 is a wasteful number, since it uses less digits than its factorization.

18102720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 302 (or 292 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 21.

The square root of 18102720 is about 4254.7291335642. The cubic root of 18102720 is about 262.5717173658.

The spelling of 18102720 in words is "eighteen million, one hundred two thousand, seven hundred twenty".