728323 has 4 divisors (see below), whose sum is σ = 733120. Its totient is φ = 723528.

The previous prime is 728317. The next prime is 728333. The reversal of 728323 is 323827.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 323827 = 7 ⋅46261.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-728323 is a prime.

It is an Ulam number.

It is a Duffinian number.

728323 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (728303) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2163 + ... + 2476.

It is an arithmetic number, because the mean of its divisors is an integer number (183280).

2⁷²⁸³²³ is an apocalyptic number.

728323 is a deficient number, since it is larger than the sum of its proper divisors (4797).

728323 is a wasteful number, since it uses less digits than its factorization.

728323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4796.

The product of its digits is 2016, while the sum is 25.

The square root of 728323 is about 853.4184202371. The cubic root of 728323 is about 89.9721312890.

Subtracting from 728323 its reverse (323827), we obtain a square (404496 = 636²).

The spelling of 728323 in words is "seven hundred twenty-eight thousand, three hundred twenty-three".