891028 has 12 divisors (see below), whose sum is σ = 1566292. Its totient is φ = 443520.

The previous prime is 891017. The next prime is 891047. The reversal of 891028 is 820198.

It can be written as a sum of positive squares in 2 ways, for example, as 478864 + 412164 = 692^2 + 642^2 .

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 890987 and 891005.

It is a congruent number.

It is an unprimeable number.

891028 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1018 + ... + 1678.

2⁸⁹¹⁰²⁸ is an apocalyptic number.

It is an amenable number.

891028 is a deficient number, since it is larger than the sum of its proper divisors (675264).

891028 is a wasteful number, since it uses less digits than its factorization.

891028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1002 (or 1000 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 28.

The square root of 891028 is about 943.9427948769. The cubic root of 891028 is about 96.2270378687.

The spelling of 891028 in words is "eight hundred ninety-one thousand, twenty-eight".