728443 has 4 divisors (see below), whose sum is σ = 731880. Its totient is φ = 725008.

The previous prime is 728437. The next prime is 728471. The reversal of 728443 is 344827.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 344827 = 7 ⋅49261.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-728443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (728423) 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 3 ways as a sum of consecutive naturals, for example, 1378 + ... + 1831.

It is an arithmetic number, because the mean of its divisors is an integer number (182970).

2⁷²⁸⁴⁴³ is an apocalyptic number.

728443 is a deficient number, since it is larger than the sum of its proper divisors (3437).

728443 is a wasteful number, since it uses less digits than its factorization.

728443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3436.

The product of its digits is 5376, while the sum is 28.

The square root of 728443 is about 853.4887228312. The cubic root of 728443 is about 89.9770723489.

It can be divided in two parts, 72 and 8443, that added together give a triangular number (8515 = T₁₃₀).

The spelling of 728443 in words is "seven hundred twenty-eight thousand, four hundred forty-three".