18287808 has 112 divisors (see below), whose sum is σ = 60374784. Its totient is φ = 4746240.

The previous prime is 18287779. The next prime is 18287821. The reversal of 18287808 is 80878281.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (112).

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a self number, because there is not a number n which added to its sum of digits gives 18287808.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14166 + ... + 15402.

Almost surely, 2^18287808 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 18287808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30187392).

18287808 is an abundant number, since it is smaller than the sum of its proper divisors (42086976).

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

18287808 is a wasteful number, since it uses less digits than its factorization.

18287808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1270 (or 1260 counting only the distinct ones).

The product of its (nonzero) digits is 57344, while the sum is 42.

The square root of 18287808 is about 4276.4246748891. The cubic root of 18287808 is about 263.4635571616.

It can be divided in two parts, 182 and 87808, that added together give a triangular number (87990 = T₄₁₉).

The spelling of 18287808 in words is "eighteen million, two hundred eighty-seven thousand, eight hundred eight".