18243532890 has 48 divisors (see below), whose sum is σ = 51745296096. Its totient is φ = 4422674400.

The previous prime is 18243532877. The next prime is 18243532907. The reversal of 18243532890 is 9823534281.

18243532890 is a `hidden beast` number, since 1 + 8 + 24 + 3 + 532 + 8 + 90 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9212916 + ... + 9214895.

It is an arithmetic number, because the mean of its divisors is an integer number (1078027002).

Almost surely, 2^18243532890 is an apocalyptic number.

18243532890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18243532890 is an abundant number, since it is smaller than the sum of its proper divisors (33501763206).

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

18243532890 is a wasteful number, since it uses less digits than its factorization.

18243532890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18427835 (or 18427832 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 45.

The spelling of 18243532890 in words is "eighteen billion, two hundred forty-three million, five hundred thirty-two thousand, eight hundred ninety".