115128550 has 24 divisors (see below), whose sum is σ = 221526000. Its totient is φ = 44462880.

The previous prime is 115128511. The next prime is 115128551. The reversal of 115128550 is 55821511.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (115128551) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 38250 + ... + 41149.

It is an arithmetic number, because the mean of its divisors is an integer number (9230250).

Almost surely, 2^115128550 is an apocalyptic number.

115128550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

115128550 is a deficient number, since it is larger than the sum of its proper divisors (106397450).

115128550 is a wasteful number, since it uses less digits than its factorization.

115128550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79440 (or 79435 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 28.

The square root of 115128550 is about 10729.7972953826. The cubic root of 115128550 is about 486.4755431625.

The spelling of 115128550 in words is "one hundred fifteen million, one hundred twenty-eight thousand, five hundred fifty".