728866 has 4 divisors (see below), whose sum is σ = 1093302. Its totient is φ = 364432.

The previous prime is 728851. The next prime is 728867. The reversal of 728866 is 668827.

728866 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 668827 = 29 ⋅23063.

It can be written as a sum of positive squares in only one way, i.e., 585225 + 143641 = 765^2 + 379^2 .

It is not an unprimeable number, because it can be changed into a prime (728867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 182215 + ... + 182218.

2⁷²⁸⁸⁶⁶ is an apocalyptic number.

728866 is a deficient number, since it is larger than the sum of its proper divisors (364436).

728866 is a wasteful number, since it uses less digits than its factorization.

728866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 364435.

The product of its digits is 32256, while the sum is 37.

The square root of 728866 is about 853.7364933046. The cubic root of 728866 is about 89.9944852588.

The spelling of 728866 in words is "seven hundred twenty-eight thousand, eight hundred sixty-six".