856428 has 48 divisors (see below), whose sum is σ = 2177280. Its totient is φ = 261184.

The previous prime is 856421. The next prime is 856441. The reversal of 856428 is 824658.

It is not an unprimeable number, because it can be changed into a prime (856421) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7951 + ... + 8057.

It is an arithmetic number, because the mean of its divisors is an integer number (45360).

2⁸⁵⁶⁴²⁸ 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 856428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1088640).

856428 is an abundant number, since it is smaller than the sum of its proper divisors (1320852).

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

856428 is a wasteful number, since it uses less digits than its factorization.

856428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166 (or 164 counting only the distinct ones).

The product of its digits is 15360, while the sum is 33.

The square root of 856428 is about 925.4339522624. The cubic root of 856428 is about 94.9650101984.

The spelling of 856428 in words is "eight hundred fifty-six thousand, four hundred twenty-eight".