728539 has 8 divisors (see below), whose sum is σ = 838400. Its totient is φ = 620136.

The previous prime is 728537. The next prime is 728551. The reversal of 728539 is 935827.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 728539 - 2¹ = 728537 is a prime.

It is a Duffinian number.

728539 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (728537) 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 7 ways as a sum of consecutive naturals, for example, 1132 + ... + 1654.

It is an arithmetic number, because the mean of its divisors is an integer number (104800).

2⁷²⁸⁵³⁹ is an apocalyptic number.

728539 is a deficient number, since it is larger than the sum of its proper divisors (109861).

728539 is a wasteful number, since it uses less digits than its factorization.

728539 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 729.

The product of its digits is 15120, while the sum is 34.

The square root of 728539 is about 853.5449607373. The cubic root of 728539 is about 89.9810248062.

The spelling of 728539 in words is "seven hundred twenty-eight thousand, five hundred thirty-nine".