18256128 has 72 divisors (see below), whose sum is σ = 53029536. Its totient is φ = 5529600.

The previous prime is 18256097. The next prime is 18256153. The reversal of 18256128 is 82165281.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 7368 + ... + 9528.

Almost surely, 2^18256128 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 18256128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26514768).

18256128 is an abundant number, since it is smaller than the sum of its proper divisors (34773408).

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

18256128 is a wasteful number, since it uses less digits than its factorization.

18256128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2191 (or 2177 counting only the distinct ones).

The product of its digits is 7680, while the sum is 33.

The square root of 18256128 is about 4272.7190406110. The cubic root of 18256128 is about 263.3113364453.

The spelling of 18256128 in words is "eighteen million, two hundred fifty-six thousand, one hundred twenty-eight".