18663008 has 144 divisors (see below), whose sum is σ = 49805280. Its totient is φ = 6709248.

The previous prime is 18662999. The next prime is 18663013. The reversal of 18663008 is 80036681.

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

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, 643538 + ... + 643566.

It is an arithmetic number, because the mean of its divisors is an integer number (345870).

Almost surely, 2^18663008 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 18663008, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24902640).

18663008 is an abundant number, since it is smaller than the sum of its proper divisors (31142272).

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

18663008 is a wasteful number, since it uses less digits than its factorization.

18663008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89 (or 68 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 18663008 is about 4320.0703697972. The cubic root of 18663008 is about 265.2531483893.

Adding to 18663008 its reverse (80036681), we get a palindrome (98699689).

The spelling of 18663008 in words is "eighteen million, six hundred sixty-three thousand, eight".