856728 has 48 divisors (see below), whose sum is σ = 2366520. Its totient is φ = 279936.

The previous prime is 856721. The next prime is 856733. The reversal of 856728 is 827658.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 856692 and 856701.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (856721) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5175 + ... + 5337.

2⁸⁵⁶⁷²⁸ 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 856728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1183260).

856728 is an abundant number, since it is smaller than the sum of its proper divisors (1509792).

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

856728 is a wasteful number, since it uses less digits than its factorization.

856728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 248 (or 241 counting only the distinct ones).

The product of its digits is 26880, while the sum is 36.

The square root of 856728 is about 925.5960241920. The cubic root of 856728 is about 94.9760974029.

The spelling of 856728 in words is "eight hundred fifty-six thousand, seven hundred twenty-eight".