18890090250 has 64 divisors (see below), whose sum is σ = 48670682112. Its totient is φ = 4874856000.

The previous prime is 18890090249. The next prime is 18890090287. The reversal of 18890090250 is 5209009881.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 382989 + ... + 429488.

It is an arithmetic number, because the mean of its divisors is an integer number (760479408).

Almost surely, 2^18890090250 is an apocalyptic number.

18890090250 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18890090250 is an abundant number, since it is smaller than the sum of its proper divisors (29780591862).

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

18890090250 is a wasteful number, since it uses less digits than its factorization.

18890090250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 812528 (or 812518 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 42.

The spelling of 18890090250 in words is "eighteen billion, eight hundred ninety million, ninety thousand, two hundred fifty".