111228 has 48 divisors (see below), whose sum is σ = 301056. Its totient is φ = 31680.

The previous prime is 111227. The next prime is 111229. The reversal of 111228 is 822111.

It is an interprime number because it is at equal distance from previous prime (111227) and next prime (111229).

It is a plaindrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111227) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3573 + ... + 3603.

It is an arithmetic number, because the mean of its divisors is an integer number (6272).

2¹¹¹²²⁸ 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 111228, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (150528).

111228 is an abundant number, since it is smaller than the sum of its proper divisors (189828).

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

111228 is a wasteful number, since it uses less digits than its factorization.

111228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74 (or 72 counting only the distinct ones).

The product of its digits is 32, while the sum is 15.

The square root of 111228 is about 333.5086205782. The cubic root of 111228 is about 48.0918380637.

Adding to 111228 its reverse (822111), we get a palindrome (933339).

The spelling of 111228 in words is "one hundred eleven thousand, two hundred twenty-eight".