891128 has 16 divisors (see below), whose sum is σ = 1909680. Its totient is φ = 381888.

The previous prime is 891103. The next prime is 891133. The reversal of 891128 is 821198.

It is a super-2 number, since 2×891128² = 1588218224768, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 891128.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 7901 + ... + 8012.

It is an arithmetic number, because the mean of its divisors is an integer number (119355).

2⁸⁹¹¹²⁸ is an apocalyptic number.

It is an amenable number.

891128 is an abundant number, since it is smaller than the sum of its proper divisors (1018552).

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

891128 is a wasteful number, since it uses less digits than its factorization.

891128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15926 (or 15922 counting only the distinct ones).

The product of its digits is 1152, while the sum is 29.

The square root of 891128 is about 943.9957627024. The cubic root of 891128 is about 96.2306375849.

The spelling of 891128 in words is "eight hundred ninety-one thousand, one hundred twenty-eight".