18990087800 has 24 divisors (see below), whose sum is σ = 44151954600. Its totient is φ = 7596035040.

The previous prime is 18990087799. The next prime is 18990087803. The reversal of 18990087800 is 878009981.

It is a happy number.

It is a hoax number, since the sum of its digits (50) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (50).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18990087803) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 47475020 + ... + 47475419.

It is an arithmetic number, because the mean of its divisors is an integer number (1839664775).

Almost surely, 2^18990087800 is an apocalyptic number.

18990087800 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18990087800 is an abundant number, since it is smaller than the sum of its proper divisors (25161866800).

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

18990087800 is a wasteful number, since it uses less digits than its factorization.

18990087800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94950455 (or 94950446 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 50.

The spelling of 18990087800 in words is "eighteen billion, nine hundred ninety million, eighty-seven thousand, eight hundred".