18128320 has 56 divisors (see below), whose sum is σ = 49341024. Its totient is φ = 6214656.

The previous prime is 18128317. The next prime is 18128329. The reversal of 18128320 is 2382181.

It is a tau number, because it is divible by the number of its divisors (56).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18128329) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1807 + ... + 6286.

Almost surely, 2^18128320 is an apocalyptic number.

18128320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18128320 is an abundant number, since it is smaller than the sum of its proper divisors (31212704).

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

18128320 is an equidigital number, since it uses as much as digits as its factorization.

18128320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8117 (or 8107 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 25.

The square root of 18128320 is about 4257.7364878536. The cubic root of 18128320 is about 262.6954311850.

The spelling of 18128320 in words is "eighteen million, one hundred twenty-eight thousand, three hundred twenty".