728231 has 4 divisors (see below), whose sum is σ = 832272. Its totient is φ = 624192.

The previous prime is 728209. The next prime is 728261. The reversal of 728231 is 132827.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 132827 = 43 ⋅3089.

It is a cyclic number.

It is not a de Polignac number, because 728231 - 2¹⁴ = 711847 is a prime.

It is a super-2 number, since 2×728231² = 1060640778722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 728197 and 728206.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 728231.

It is not an unprimeable number, because it can be changed into a prime (728261) 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, 52010 + ... + 52023.

It is an arithmetic number, because the mean of its divisors is an integer number (208068).

2⁷²⁸²³¹ is an apocalyptic number.

728231 is a deficient number, since it is larger than the sum of its proper divisors (104041).

728231 is a wasteful number, since it uses less digits than its factorization.

728231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104040.

The product of its digits is 672, while the sum is 23.

The square root of 728231 is about 853.3645176594. The cubic root of 728231 is about 89.9683427754.

It can be divided in two parts, 728 and 231, that added together give a palindrome (959).

The spelling of 728231 in words is "seven hundred twenty-eight thousand, two hundred thirty-one".