18257340990 has 32 divisors (see below), whose sum is σ = 50077278720. Its totient is φ = 4173106464.

The previous prime is 18257340989. The next prime is 18257341021. The reversal of 18257340990 is 9904375281.

It is a super-4 number, since 4×18257340990⁴ (a number of 42 digits) contains 4444 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43469650 + ... + 43470069.

It is an arithmetic number, because the mean of its divisors is an integer number (1564914960).

Almost surely, 2^18257340990 is an apocalyptic number.

18257340990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18257340990 is an abundant number, since it is smaller than the sum of its proper divisors (31819937730).

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

18257340990 is a wasteful number, since it uses less digits than its factorization.

18257340990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86939736.

The product of its (nonzero) digits is 544320, while the sum is 48.

The spelling of 18257340990 in words is "eighteen billion, two hundred fifty-seven million, three hundred forty thousand, nine hundred ninety".