115515520 has 64 divisors (see below), whose sum is σ = 277848000. Its totient is φ = 45923328.

The previous prime is 115515479. The next prime is 115515539. The reversal of 115515520 is 25515511.

It is a tau number, because it is divible by the number of its divisors (64).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 126907 + ... + 127813.

It is an arithmetic number, because the mean of its divisors is an integer number (4341375).

Almost surely, 2^115515520 is an apocalyptic number.

115515520 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 115515520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (138924000).

115515520 is an abundant number, since it is smaller than the sum of its proper divisors (162332480).

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

115515520 is an equidigital number, since it uses as much as digits as its factorization.

115515520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1125 (or 1113 counting only the distinct ones).

The product of its (nonzero) digits is 1250, while the sum is 25.

The square root of 115515520 is about 10747.8146615952. The cubic root of 115515520 is about 487.0199807124.

Subtracting from 115515520 its reverse (25515511), we obtain a palindrome (90000009).

It can be divided in two parts, 11551 and 5520, that added together give a palindrome (17071).

The spelling of 115515520 in words is "one hundred fifteen million, five hundred fifteen thousand, five hundred twenty".