18235668 has 72 divisors (see below), whose sum is σ = 49305760. Its totient is φ = 5227200.

The previous prime is 18235667. The next prime is 18235673. The reversal of 18235668 is 86653281.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18235667) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 27258 + ... + 27918.

Almost surely, 2^18235668 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18235668, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24652880).

18235668 is an abundant number, since it is smaller than the sum of its proper divisors (31070092).

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

18235668 is a wasteful number, since it uses less digits than its factorization.

18235668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 709 (or 696 counting only the distinct ones).

The product of its digits is 69120, while the sum is 39.

The square root of 18235668 is about 4270.3241094793. The cubic root of 18235668 is about 263.2129336192.

The spelling of 18235668 in words is "eighteen million, two hundred thirty-five thousand, six hundred sixty-eight".