18087784640 has 28 divisors (see below), whose sum is σ = 43071537936. Its totient is φ = 7235113728.

The previous prime is 18087784549. The next prime is 18087784657. The reversal of 18087784640 is 4648778081.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28261844 + ... + 28262483.

It is an arithmetic number, because the mean of its divisors is an integer number (1538269212).

Almost surely, 2^18087784640 is an apocalyptic number.

18087784640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18087784640 is an abundant number, since it is smaller than the sum of its proper divisors (24983753296).

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

18087784640 is an equidigital number, since it uses as much as digits as its factorization.

18087784640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56524344 (or 56524334 counting only the distinct ones).

The product of its (nonzero) digits is 2408448, while the sum is 53.

The spelling of 18087784640 in words is "eighteen billion, eighty-seven million, seven hundred eighty-four thousand, six hundred forty".