18028080 has 240 divisors, whose sum is σ = 71572800. Its totient is φ = 4064256.

The previous prime is 18028079. The next prime is 18028091. The reversal of 18028080 is 8082081.

It is a tau number, because it is divible by the number of its divisors (240).

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 246924 + ... + 246996.

It is an arithmetic number, because the mean of its divisors is an integer number (298220).

Almost surely, 2^18028080 is an apocalyptic number.

18028080 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 18028080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35786400).

18028080 is an abundant number, since it is smaller than the sum of its proper divisors (53544720).

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

18028080 is a wasteful number, since it uses less digits than its factorization.

18028080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113 (or 90 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 27.

The square root of 18028080 is about 4245.9486572496. The cubic root of 18028080 is about 262.2103471699.

The spelling of 18028080 in words is "eighteen million, twenty-eight thousand, eighty".