128831598 has 48 divisors (see below), whose sum is σ = 329312256. Its totient is φ = 35620560.

The previous prime is 128831581. The next prime is 128831621. The reversal of 128831598 is 895138821.

It is a happy number.

128831598 is a `hidden beast` number, since 1 + 28 + 8 + 31 + 598 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12586 + ... + 20397.

It is an arithmetic number, because the mean of its divisors is an integer number (6860672).

Almost surely, 2^128831598 is an apocalyptic number.

128831598 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

128831598 is an abundant number, since it is smaller than the sum of its proper divisors (200480658).

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

128831598 is a wasteful number, since it uses less digits than its factorization.

128831598 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33029 (or 33026 counting only the distinct ones).

The product of its digits is 138240, while the sum is 45.

The square root of 128831598 is about 11350.4007858754. The cubic root of 128831598 is about 505.0574688707.

The spelling of 128831598 in words is "one hundred twenty-eight million, eight hundred thirty-one thousand, five hundred ninety-eight".