18090890320 has 40 divisors (see below), whose sum is σ = 42956250624. Its totient is φ = 7082389632.

The previous prime is 18090890267. The next prime is 18090890333. The reversal of 18090890320 is 2309809081.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2401944 + ... + 2409463.

Almost surely, 2^18090890320 is an apocalyptic number.

18090890320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18090890320 is an abundant number, since it is smaller than the sum of its proper divisors (24865360304).

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

18090890320 is a wasteful number, since it uses less digits than its factorization.

18090890320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4811467 (or 4811461 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 40.

The spelling of 18090890320 in words is "eighteen billion, ninety million, eight hundred ninety thousand, three hundred twenty".