111399121999728 has 60 divisors (see below), whose sum is σ = 311811331483288. Its totient is φ = 37127262695040.

The previous prime is 111399121999727. The next prime is 111399121999757. The reversal of 111399121999728 is 827999121993111.

111399121999728 is a `hidden beast` number, since 1 + 1 + 1 + 399 + 121 + 9 + 9 + 97 + 28 = 666.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111399121999727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 59258503 + ... + 61109478.

Almost surely, 2^{111399121999728} is an apocalyptic number.

111399121999728 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

111399121999728 is an abundant number, since it is smaller than the sum of its proper divisors (200412209483560).

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

111399121999728 is a wasteful number, since it uses less digits than its factorization.

111399121999728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120374422 (or 120374413 counting only the distinct ones).

The product of its digits is 39680928, while the sum is 72.

The spelling of 111399121999728 in words is "one hundred eleven trillion, three hundred ninety-nine billion, one hundred twenty-one million, nine hundred ninety-nine thousand, seven hundred twenty-eight".