216228 has 24 divisors (see below), whose sum is σ = 519232. Its totient is φ = 69984.

The previous prime is 216217. The next prime is 216233. The reversal of 216228 is 822612.

It is an unprimeable number.

216228 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 201 + ... + 687.

2²¹⁶²²⁸ is an apocalyptic number.

It is an amenable number.

216228 is an abundant number, since it is smaller than the sum of its proper divisors (303004).

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

216228 is a wasteful number, since it uses less digits than its factorization.

216228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 531 (or 529 counting only the distinct ones).

The product of its digits is 384, while the sum is 21.

The square root of 216228 is about 465.0032257953. The cubic root of 216228 is about 60.0211036875.

Adding to 216228 its product of digits (384), we get a palindrome (216612).

It can be divided in two parts, 216 and 228, that added together give a palindrome (444).

The spelling of 216228 in words is "two hundred sixteen thousand, two hundred twenty-eight".