891066 has 32 divisors (see below), whose sum is σ = 2032128. Its totient is φ = 257840.

The previous prime is 891061. The next prime is 891067. The reversal of 891066 is 660198.

It is not an unprimeable number, because it can be changed into a prime (891061) 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 15 ways as a sum of consecutive naturals, for example, 1225 + ... + 1811.

It is an arithmetic number, because the mean of its divisors is an integer number (63504).

2⁸⁹¹⁰⁶⁶ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 891066, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1016064).

891066 is an abundant number, since it is smaller than the sum of its proper divisors (1141062).

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

891066 is a wasteful number, since it uses less digits than its factorization.

891066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 626.

The product of its (nonzero) digits is 2592, while the sum is 30.

The square root of 891066 is about 943.9629230007. The cubic root of 891066 is about 96.2284057926.

The spelling of 891066 in words is "eight hundred ninety-one thousand, sixty-six".