728243 has 4 divisors (see below), whose sum is σ = 729960. Its totient is φ = 726528.

The previous prime is 728209. The next prime is 728261. The reversal of 728243 is 342827.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 342827 = 131 ⋅2617.

It is a cyclic number.

It is not a de Polignac number, because 728243 - 2¹⁴ = 711859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (728293) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 296 + ... + 1242.

It is an arithmetic number, because the mean of its divisors is an integer number (182490).

2⁷²⁸²⁴³ is an apocalyptic number.

728243 is a deficient number, since it is larger than the sum of its proper divisors (1717).

728243 is an equidigital number, since it uses as much as digits as its factorization.

728243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1716.

The product of its digits is 2688, while the sum is 26.

The square root of 728243 is about 853.3715486235. The cubic root of 728243 is about 89.9688369475.

It can be divided in two parts, 72824 and 3, that added together give a palindrome (72827).

The spelling of 728243 in words is "seven hundred twenty-eight thousand, two hundred forty-three".