728589 has 4 divisors (see below), whose sum is σ = 971456. Its totient is φ = 485724.

The previous prime is 728579. The next prime is 728627. The reversal of 728589 is 985827.

728589 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 728589 - 2⁴ = 728573 is a prime.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (728579) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 121429 + ... + 121434.

It is an arithmetic number, because the mean of its divisors is an integer number (242864).

2⁷²⁸⁵⁸⁹ is an apocalyptic number.

It is an amenable number.

728589 is a deficient number, since it is larger than the sum of its proper divisors (242867).

728589 is a wasteful number, since it uses less digits than its factorization.

728589 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242866.

The product of its digits is 40320, while the sum is 39.

The square root of 728589 is about 853.5742498459. The cubic root of 728589 is about 89.9830832402.

The spelling of 728589 in words is "seven hundred twenty-eight thousand, five hundred eighty-nine".