18098568 has 48 divisors (see below), whose sum is σ = 49334220. Its totient is φ = 5993856.

The previous prime is 18098543. The next prime is 18098569. The reversal of 18098568 is 86589081.

18098568 is a `hidden beast` number, since 1 + 80 + 9 + 8 + 568 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 13089924 + 5008644 = 3618^2 + 2238^2 .

It is not an unprimeable number, because it can be changed into a prime (18098569) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11730 + ... + 13182.

Almost surely, 2^18098568 is an apocalyptic number.

18098568 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18098568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24667110).

18098568 is an abundant number, since it is smaller than the sum of its proper divisors (31235652).

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

18098568 is a wasteful number, since it uses less digits than its factorization.

18098568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1638 (or 1631 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 45.

The square root of 18098568 is about 4254.2411779306. The cubic root of 18098568 is about 262.5516415406.

The spelling of 18098568 in words is "eighteen million, ninety-eight thousand, five hundred sixty-eight".