181228 has 6 divisors (see below), whose sum is σ = 317156. Its totient is φ = 90612.

The previous prime is 181219. The next prime is 181243. The reversal of 181228 is 822181.

It is a junction number, because it is equal to n+sod(n) for n = 181199 and 181208.

It is an unprimeable number.

181228 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 as a sum of consecutive naturals, namely, 22650 + ... + 22657.

2¹⁸¹²²⁸ is an apocalyptic number.

It is an amenable number.

181228 is a deficient number, since it is larger than the sum of its proper divisors (135928).

181228 is a wasteful number, since it uses less digits than its factorization.

181228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45311 (or 45309 counting only the distinct ones).

The product of its digits is 256, while the sum is 22.

The square root of 181228 is about 425.7088206744. The cubic root of 181228 is about 56.5902699835.

The spelling of 181228 in words is "one hundred eighty-one thousand, two hundred twenty-eight".