115565780 has 24 divisors (see below), whose sum is σ = 264751200. Its totient is φ = 42023840.

The previous prime is 115565761. The next prime is 115565831. The reversal of 115565780 is 87565511.

It is a happy number.

It is a congruent number.

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, 262430 + ... + 262869.

It is an arithmetic number, because the mean of its divisors is an integer number (11031300).

Almost surely, 2^115565780 is an apocalyptic number.

115565780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

115565780 is an abundant number, since it is smaller than the sum of its proper divisors (149185420).

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

115565780 is a wasteful number, since it uses less digits than its factorization.

115565780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 525319 (or 525317 counting only the distinct ones).

The product of its (nonzero) digits is 42000, while the sum is 38.

The square root of 115565780 is about 10750.1525570570. The cubic root of 115565780 is about 487.0906034739.

The spelling of 115565780 in words is "one hundred fifteen million, five hundred sixty-five thousand, seven hundred eighty".