728823 has 8 divisors (see below), whose sum is σ = 983808. Its totient is φ = 479864.

The previous prime is 728813. The next prime is 728831. The reversal of 728823 is 328827.

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

It is a cyclic number.

It is not a de Polignac number, because 728823 - 2¹⁰ = 727799 is a prime.

It is a super-3 number, since 3×728823³ = 1161415087019933301, which contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (728813) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1215 + ... + 1712.

It is an arithmetic number, because the mean of its divisors is an integer number (122976).

2⁷²⁸⁸²³ is an apocalyptic number.

728823 is a deficient number, since it is larger than the sum of its proper divisors (254985).

728823 is a wasteful number, since it uses less digits than its factorization.

728823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3013.

The product of its digits is 5376, while the sum is 30.

The square root of 728823 is about 853.7113095186. The cubic root of 728823 is about 89.9927154598.

It can be divided in two parts, 728 and 823, that added together give a palindrome (1551).

The spelling of 728823 in words is "seven hundred twenty-eight thousand, eight hundred twenty-three".