728865 has 16 divisors (see below), whose sum is σ = 1296000. Its totient is φ = 388656.

The previous prime is 728851. The next prime is 728867. The reversal of 728865 is 568827.

728865 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 728865 - 2¹² = 724769 is a prime.

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 in 15 ways as a sum of consecutive naturals, for example, 2565 + ... + 2834.

It is an arithmetic number, because the mean of its divisors is an integer number (81000).

2⁷²⁸⁸⁶⁵ is an apocalyptic number.

It is an amenable number.

728865 is a deficient number, since it is larger than the sum of its proper divisors (567135).

728865 is a wasteful number, since it uses less digits than its factorization.

728865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5413 (or 5407 counting only the distinct ones).

The product of its digits is 26880, while the sum is 36.

The square root of 728865 is about 853.7359076436. The cubic root of 728865 is about 89.9944441015.

The spelling of 728865 in words is "seven hundred twenty-eight thousand, eight hundred sixty-five".