115990128 has 30 divisors (see below), whose sum is σ = 324611664. Its totient is φ = 38663328.

The previous prime is 115990123. The next prime is 115990139. The reversal of 115990128 is 821099511.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 115990092 and 115990101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (115990123) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 402600 + ... + 402887.

Almost surely, 2^115990128 is an apocalyptic number.

115990128 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

115990128 is an abundant number, since it is smaller than the sum of its proper divisors (208621536).

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

115990128 is a wasteful number, since it uses less digits than its factorization.

115990128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 805501 (or 805492 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 36.

The square root of 115990128 is about 10769.8713084233. The cubic root of 115990128 is about 487.6860607339.

It can be divided in two parts, 1159901 and 28, that added together give a square (1159929 = 1077²).

The spelling of 115990128 in words is "one hundred fifteen million, nine hundred ninety thousand, one hundred twenty-eight".