831790128 has 40 divisors (see below), whose sum is σ = 2314084528. Its totient is φ = 255935232.

The previous prime is 831790117. The next prime is 831790129. The reversal of 831790128 is 821097138.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (831790129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 665875 + ... + 667122.

Almost surely, 2^831790128 is an apocalyptic number.

It is an amenable number.

831790128 is an abundant number, since it is smaller than the sum of its proper divisors (1482294400).

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

831790128 is a wasteful number, since it uses less digits than its factorization.

831790128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1333021 (or 1333015 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 39.

The square root of 831790128 is about 28840.7719730246. The cubic root of 831790128 is about 940.4547852145.

The spelling of 831790128 in words is "eight hundred thirty-one million, seven hundred ninety thousand, one hundred twenty-eight".