18208768 has 48 divisors (see below), whose sum is σ = 38624040. Its totient is φ = 8552448.

The previous prime is 18208763. The next prime is 18208793. The reversal of 18208768 is 86780281.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 18208768.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18208763) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34555 + ... + 35077.

Almost surely, 2^18208768 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 18208768, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19312020).

18208768 is an abundant number, since it is smaller than the sum of its proper divisors (20415272).

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

18208768 is an equidigital number, since it uses as much as digits as its factorization.

18208768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 562 (or 542 counting only the distinct ones).

The product of its (nonzero) digits is 43008, while the sum is 40.

The square root of 18208768 is about 4267.1733032536. The cubic root of 18208768 is about 263.0834454043.

The spelling of 18208768 in words is "eighteen million, two hundred eight thousand, seven hundred sixty-eight".