865228 has 24 divisors (see below), whose sum is σ = 1864352. Its totient is φ = 342144.

The previous prime is 865217. The next prime is 865231. The reversal of 865228 is 822568.

It is a self number, because there is not a number n which added to its sum of digits gives 865228.

It is an unprimeable number.

865228 is an untouchable number, because it is not equal to the sum of proper divisors of any 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 7 ways as a sum of consecutive naturals, for example, 825 + ... + 1552.

2⁸⁶⁵²²⁸ is an apocalyptic number.

It is an amenable number.

865228 is an abundant number, since it is smaller than the sum of its proper divisors (999124).

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

865228 is a wasteful number, since it uses less digits than its factorization.

865228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2401 (or 2399 counting only the distinct ones).

The product of its digits is 7680, while the sum is 31.

The square root of 865228 is about 930.1763273702. The cubic root of 865228 is about 95.2891651018.

The spelling of 865228 in words is "eight hundred sixty-five thousand, two hundred twenty-eight".