111778017728 has 112 divisors (see below), whose sum is σ = 240444771840. Its totient is φ = 51251481600.

The previous prime is 111778017677. The next prime is 111778017731. The reversal of 111778017728 is 827710877111.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 108416573 + ... + 108417603.

It is an arithmetic number, because the mean of its divisors is an integer number (2146828320).

Almost surely, 2^111778017728 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 111778017728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (120222385920).

111778017728 is an abundant number, since it is smaller than the sum of its proper divisors (128666754112).

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

111778017728 is a wasteful number, since it uses less digits than its factorization.

111778017728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1786 (or 1776 counting only the distinct ones).

The product of its (nonzero) digits is 307328, while the sum is 50.

The spelling of 111778017728 in words is "one hundred eleven billion, seven hundred seventy-eight million, seventeen thousand, seven hundred twenty-eight".