728565 has 8 divisors (see below), whose sum is σ = 1165728. Its totient is φ = 388560.

The previous prime is 728561. The next prime is 728573. The reversal of 728565 is 565827.

It is a happy number.

728565 is digitally balanced in base 7, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 728565 - 2² = 728561 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

728565 is strictly pandigital in base 7.

728565 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (728561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24271 + ... + 24300.

It is an arithmetic number, because the mean of its divisors is an integer number (145716).

2⁷²⁸⁵⁶⁵ is an apocalyptic number.

It is an amenable number.

728565 is a deficient number, since it is larger than the sum of its proper divisors (437163).

728565 is a wasteful number, since it uses less digits than its factorization.

728565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48579.

The product of its digits is 16800, while the sum is 33.

The square root of 728565 is about 853.5601911992. The cubic root of 728565 is about 89.9820952036.

The spelling of 728565 in words is "seven hundred twenty-eight thousand, five hundred sixty-five".