18668868 has 48 divisors (see below), whose sum is σ = 47113920. Its totient is φ = 5733504.

The previous prime is 18668861. The next prime is 18668921. The reversal of 18668868 is 86886681.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 18668868.

It is not an unprimeable number, because it can be changed into a prime (18668861) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7330 + ... + 9542.

It is an arithmetic number, because the mean of its divisors is an integer number (981540).

Almost surely, 2^18668868 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 18668868, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23556960).

18668868 is an abundant number, since it is smaller than the sum of its proper divisors (28445052).

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

18668868 is a wasteful number, since it uses less digits than its factorization.

18668868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2276 (or 2274 counting only the distinct ones).

The product of its digits is 884736, while the sum is 51.

The square root of 18668868 is about 4320.7485462591. The cubic root of 18668868 is about 265.2809077728.

The spelling of 18668868 in words is "eighteen million, six hundred sixty-eight thousand, eight hundred sixty-eight".