18228288 has 112 divisors (see below), whose sum is σ = 53197760. Its totient is φ = 5474304.

The previous prime is 18228281. The next prime is 18228293. The reversal of 18228288 is 88282281.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (18228281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 167178 + ... + 167286.

It is an arithmetic number, because the mean of its divisors is an integer number (474980).

Almost surely, 2^18228288 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 18228288, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26598880).

18228288 is an abundant number, since it is smaller than the sum of its proper divisors (34969472).

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

18228288 is a wasteful number, since it uses less digits than its factorization.

18228288 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204 (or 194 counting only the distinct ones).

The product of its digits is 32768, while the sum is 39.

The square root of 18228288 is about 4269.4599190061. The cubic root of 18228288 is about 263.1774212823.

The spelling of 18228288 in words is "eighteen million, two hundred twenty-eight thousand, two hundred eighty-eight".