111815228 has 48 divisors (see below), whose sum is σ = 238990080. Its totient is φ = 44706816.

The previous prime is 111815227. The next prime is 111815251. The reversal of 111815228 is 822518111.

It is a self number, because there is not a number n which added to its sum of digits gives 111815228.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111815227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34076 + ... + 37212.

It is an arithmetic number, because the mean of its divisors is an integer number (4978960).

Almost surely, 2^111815228 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 111815228, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (119495040).

111815228 is an abundant number, since it is smaller than the sum of its proper divisors (127174852).

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

111815228 is a wasteful number, since it uses less digits than its factorization.

111815228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3234 (or 3232 counting only the distinct ones).

The product of its digits is 1280, while the sum is 29.

The square root of 111815228 is about 10574.2719843968. The cubic root of 111815228 is about 481.7632314519.

The spelling of 111815228 in words is "one hundred eleven million, eight hundred fifteen thousand, two hundred twenty-eight".