228018 has 32 divisors (see below), whose sum is σ = 535680. Its totient is φ = 63360.

The previous prime is 228013. The next prime is 228023. The reversal of 228018 is 810822.

It is an interprime number because it is at equal distance from previous prime (228013) and next prime (228023).

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 227985 and 228003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228013) by changing a digit.

228018 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2518 + ... + 2606.

It is an arithmetic number, because the mean of its divisors is an integer number (16740).

2²²⁸⁰¹⁸ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 228018, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (267840).

228018 is an abundant number, since it is smaller than the sum of its proper divisors (307662).

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

228018 is a wasteful number, since it uses less digits than its factorization.

228018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162.

The product of its (nonzero) digits is 256, while the sum is 21.

The square root of 228018 is about 477.5123035064. The cubic root of 228018 is about 61.0927550624.

The spelling of 228018 in words is "two hundred twenty-eight thousand, eighteen".