18128080 has 20 divisors (see below), whose sum is σ = 42147972. Its totient is φ = 7251200.

The previous prime is 18128063. The next prime is 18128081. The reversal of 18128080 is 8082181.

It can be written as a sum of positive squares in 2 ways, for example, as 14348944 + 3779136 = 3788^2 + 1944^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18128081) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 113221 + ... + 113380.

Almost surely, 2^18128080 is an apocalyptic number.

18128080 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18128080 is an abundant number, since it is smaller than the sum of its proper divisors (24019892).

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

18128080 is a wasteful number, since it uses less digits than its factorization.

18128080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226614 (or 226608 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 28.

The square root of 18128080 is about 4257.7083037709. The cubic root of 18128080 is about 262.6942719089.

The spelling of 18128080 in words is "eighteen million, one hundred twenty-eight thousand, eighty".