851228 has 36 divisors (see below), whose sum is σ = 1790712. Its totient is φ = 352800.

The previous prime is 851209. The next prime is 851231. The reversal of 851228 is 822158.

It is a junction number, because it is equal to n+sod(n) for n = 851197 and 851206.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8378 + ... + 8478.

It is an arithmetic number, because the mean of its divisors is an integer number (49742).

2⁸⁵¹²²⁸ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 851228, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (895356).

851228 is an abundant number, since it is smaller than the sum of its proper divisors (939484).

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

851228 is a wasteful number, since it uses less digits than its factorization.

851228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162 (or 153 counting only the distinct ones).

The product of its digits is 1280, while the sum is 26.

The square root of 851228 is about 922.6201818733. The cubic root of 851228 is about 94.7724192347.

Subtracting from 851228 its product of digits (1280), we obtain a palindrome (849948).

The spelling of 851228 in words is "eight hundred fifty-one thousand, two hundred twenty-eight".