18413568 has 144 divisors (see below), whose sum is σ = 56642040. Its totient is φ = 5971968.

The previous prime is 18413561. The next prime is 18413581. The reversal of 18413568 is 86531481.

18413568 is a `hidden beast` number, since 1 + 84 + 13 + 568 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nialpdrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18413561) 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, 497646 + ... + 497682.

Almost surely, 2^18413568 is an apocalyptic number.

18413568 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 18413568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28321020).

18413568 is an abundant number, since it is smaller than the sum of its proper divisors (38228472).

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

18413568 is an frugal number, since it uses more digits than its factorization.

18413568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74 (or 42 counting only the distinct ones).

The product of its digits is 23040, while the sum is 36.

The square root of 18413568 is about 4291.1033546164. The cubic root of 18413568 is about 264.0660991515.

It can be divided in two parts, 18413 and 568, that added together give a palindrome (18981).

The spelling of 18413568 in words is "eighteen million, four hundred thirteen thousand, five hundred sixty-eight".