115565520 has 240 divisors, whose sum is σ = 431543808. Its totient is φ = 25482240.

The previous prime is 115565491. The next prime is 115565539. The reversal of 115565520 is 25565511.

It is a tau number, because it is divible by the number of its divisors (240).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 364402 + ... + 364718.

Almost surely, 2^115565520 is an apocalyptic number.

115565520 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 115565520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (215771904).

115565520 is an abundant number, since it is smaller than the sum of its proper divisors (315978288).

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

115565520 is a wasteful number, since it uses less digits than its factorization.

115565520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 378 (or 365 counting only the distinct ones).

The product of its (nonzero) digits is 7500, while the sum is 30.

The square root of 115565520 is about 10750.1404641986. The cubic root of 115565520 is about 487.0902381880.

Subtracting from 115565520 its reverse (25565511), we obtain a palindrome (90000009).

The spelling of 115565520 in words is "one hundred fifteen million, five hundred sixty-five thousand, five hundred twenty".