115721856 has 192 divisors, whose sum is σ = 372340800. Its totient is φ = 34283520.

The previous prime is 115721821. The next prime is 115721867. The reversal of 115721856 is 658127511.

115721856 is a `hidden beast` number, since 1 + 1 + 572 + 1 + 85 + 6 = 666.

It is a tau number, because it is divible by the number of its divisors (192).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 115721856.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 371941 + ... + 372251.

It is an arithmetic number, because the mean of its divisors is an integer number (1939275).

Almost surely, 2^115721856 is an apocalyptic number.

115721856 is a gapful number since it is divisible by the number (16) 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 115721856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (186170400).

115721856 is an abundant number, since it is smaller than the sum of its proper divisors (256618944).

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

115721856 is a wasteful number, since it uses less digits than its factorization.

115721856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 367 (or 352 counting only the distinct ones).

The product of its digits is 16800, while the sum is 36.

The square root of 115721856 is about 10757.4093535572. The cubic root of 115721856 is about 487.3097829883.

The spelling of 115721856 in words is "one hundred fifteen million, seven hundred twenty-one thousand, eight hundred fifty-six".