111110111028 has 432 divisors, whose sum is σ = 353245261824. Its totient is φ = 28821381120.

The previous prime is 111110111027. The next prime is 111110111041. The reversal of 111110111028 is 820111011111.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a self number, because there is not a number n which added to its sum of digits gives 111110111028.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111110111027) by changing a digit.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 379215250 + ... + 379215542.

Almost surely, 2^111110111028 is an apocalyptic number.

111110111028 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 111110111028, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (176622630912).

111110111028 is an abundant number, since it is smaller than the sum of its proper divisors (242135150796).

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

111110111028 is a wasteful number, since it uses less digits than its factorization.

111110111028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 512 (or 490 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 18.

Adding to 111110111028 its reverse (820111011111), we get a palindrome (931221122139).

The spelling of 111110111028 in words is "one hundred eleven billion, one hundred ten million, one hundred eleven thousand, twenty-eight".