115989499728 has 360 divisors, whose sum is σ = 355181954400. Its totient is φ = 35234362368.

The previous prime is 115989499723. The next prime is 115989499771. The reversal of 115989499728 is 827994989511.

115989499728 is a `hidden beast` number, since 1 + 1 + 59 + 89 + 499 + 7 + 2 + 8 = 666.

It is a Smith number, since the sum of its digits (72) coincides with the sum of the digits of its prime factors.

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 (115989499723) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 647985943 + ... + 647986121.

It is an arithmetic number, because the mean of its divisors is an integer number (986616540).

Almost surely, 2^115989499728 is an apocalyptic number.

115989499728 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 115989499728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (177590977200).

115989499728 is an abundant number, since it is smaller than the sum of its proper divisors (239192454672).

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

115989499728 is a wasteful number, since it uses less digits than its factorization.

115989499728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 459 (or 413 counting only the distinct ones).

The product of its digits is 117573120, while the sum is 72.

The spelling of 115989499728 in words is "one hundred fifteen billion, nine hundred eighty-nine million, four hundred ninety-nine thousand, seven hundred twenty-eight".