728858 has 24 divisors (see below), whose sum is σ = 1263612. Its totient is φ = 313344.

The previous prime is 728851. The next prime is 728867. The reversal of 728858 is 858827.

It can be written as a sum of positive squares in 6 ways, for example, as 418609 + 310249 = 647^2 + 557^2 .

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is an Ulam number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 728858.

It is not an unprimeable number, because it can be changed into a prime (728851) by changing a digit.

728858 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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 in 11 ways as a sum of consecutive naturals, for example, 7466 + ... + 7562.

2⁷²⁸⁸⁵⁸ is an apocalyptic number.

728858 is a deficient number, since it is larger than the sum of its proper divisors (534754).

728858 is a wasteful number, since it uses less digits than its factorization.

728858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146 (or 129 counting only the distinct ones).

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

The square root of 728858 is about 853.7318080053. The cubic root of 728858 is about 89.9941559991.

The spelling of 728858 in words is "seven hundred twenty-eight thousand, eight hundred fifty-eight".