857728 has 16 divisors (see below), whose sum is σ = 1709010. Its totient is φ = 428800.

The previous prime is 857723. The next prime is 857737. The reversal of 857728 is 827758.

It can be written as a sum of positive squares in only one way, i.e., 760384 + 97344 = 872^2 + 312^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is not an unprimeable number, because it can be changed into a prime (857723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3223 + ... + 3478.

2⁸⁵⁷⁷²⁸ is an apocalyptic number.

It is an amenable number.

857728 is a deficient number, since it is larger than the sum of its proper divisors (851282).

857728 is an equidigital number, since it uses as much as digits as its factorization.

857728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6715 (or 6703 counting only the distinct ones).

The product of its digits is 31360, while the sum is 37.

The square root of 857728 is about 926.1360591187. The cubic root of 857728 is about 95.0130360689.

The spelling of 857728 in words is "eight hundred fifty-seven thousand, seven hundred twenty-eight".