851728 has 10 divisors (see below), whose sum is σ = 1650254. Its totient is φ = 425856.

The previous prime is 851723. The next prime is 851731. The reversal of 851728 is 827158.

It can be written as a sum of positive squares in only one way, i.e., 501264 + 350464 = 708^2 + 592^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 851728.

It is not an unprimeable number, because it can be changed into a prime (851723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26601 + ... + 26632.

2⁸⁵¹⁷²⁸ is an apocalyptic number.

It is an amenable number.

851728 is a deficient number, since it is larger than the sum of its proper divisors (798526).

851728 is a wasteful number, since it uses less digits than its factorization.

851728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53241 (or 53235 counting only the distinct ones).

The product of its digits is 4480, while the sum is 31.

The square root of 851728 is about 922.8911095032. The cubic root of 851728 is about 94.7909716221.

The spelling of 851728 in words is "eight hundred fifty-one thousand, seven hundred twenty-eight".