115857280 has 128 divisors (see below), whose sum is σ = 345461760. Its totient is φ = 36096000.

The previous prime is 115857277. The next prime is 115857289. The reversal of 115857280 is 82758511.

It is a tau number, because it is divible by the number of its divisors (128).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (115857289) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 48105 + ... + 50455.

It is an arithmetic number, because the mean of its divisors is an integer number (2698920).

Almost surely, 2^115857280 is an apocalyptic number.

115857280 is a gapful number since it is divisible by the number (10) 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 115857280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (172730880).

115857280 is an abundant number, since it is smaller than the sum of its proper divisors (229604480).

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

115857280 is a wasteful number, since it uses less digits than its factorization.

115857280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2388 (or 2376 counting only the distinct ones).

The product of its (nonzero) digits is 22400, while the sum is 37.

The square root of 115857280 is about 10763.7019654021. The cubic root of 115857280 is about 487.4998010080.

It can be divided in two parts, 115 and 857280, that added together give a triangular number (857395 = T₁₃₀₉).

The spelling of 115857280 in words is "one hundred fifteen million, eight hundred fifty-seven thousand, two hundred eighty".