858728 has 32 divisors (see below), whose sum is σ = 1814400. Its totient is φ = 378048.

The previous prime is 858713. The next prime is 858749. The reversal of 858728 is 827858.

It is a junction number, because it is equal to n+sod(n) for n = 858691 and 858700.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 858728.

It is an unprimeable number.

858728 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2213 + ... + 2571.

It is an arithmetic number, because the mean of its divisors is an integer number (56700).

2⁸⁵⁸⁷²⁸ 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 858728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (907200).

858728 is an abundant number, since it is smaller than the sum of its proper divisors (955672).

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

858728 is a wasteful number, since it uses less digits than its factorization.

858728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 401 (or 397 counting only the distinct ones).

The product of its digits is 35840, while the sum is 38.

The square root of 858728 is about 926.6757793317. The cubic root of 858728 is about 95.0499460356.

The spelling of 858728 in words is "eight hundred fifty-eight thousand, seven hundred twenty-eight".