866228 has 12 divisors (see below), whose sum is σ = 1653792. Its totient is φ = 393720.

The previous prime is 866221. The next prime is 866231. The reversal of 866228 is 822668.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 866194 and 866203.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 866228.

It is not an unprimeable number, because it can be changed into a prime (866221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9800 + ... + 9887.

It is an arithmetic number, because the mean of its divisors is an integer number (137816).

2⁸⁶⁶²²⁸ is an apocalyptic number.

It is an amenable number.

866228 is a deficient number, since it is larger than the sum of its proper divisors (787564).

866228 is a wasteful number, since it uses less digits than its factorization.

866228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19702 (or 19700 counting only the distinct ones).

The product of its digits is 9216, while the sum is 32.

The square root of 866228 is about 930.7137046375. The cubic root of 866228 is about 95.3258615864.

The spelling of 866228 in words is "eight hundred sixty-six thousand, two hundred twenty-eight".