728189 has 16 divisors (see below), whose sum is σ = 931200. Its totient is φ = 564480.

The previous prime is 728173. The next prime is 728191. The reversal of 728189 is 981827.

It is a happy number.

728189 is nontrivially palindromic in base 15.

It is not a de Polignac number, because 728189 - 2⁴ = 728173 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (728129) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3677 + ... + 3869.

It is an arithmetic number, because the mean of its divisors is an integer number (58200).

2⁷²⁸¹⁸⁹ is an apocalyptic number.

It is an amenable number.

728189 is a deficient number, since it is larger than the sum of its proper divisors (203011).

728189 is a wasteful number, since it uses less digits than its factorization.

728189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225 (or 211 counting only the distinct ones).

The product of its digits is 8064, while the sum is 35.

The square root of 728189 is about 853.3399088288. The cubic root of 728189 is about 89.9666131306.

It can be divided in two parts, 72818 and 9, that added together give a palindrome (72827).

The spelling of 728189 in words is "seven hundred twenty-eight thousand, one hundred eighty-nine".