728587 has 4 divisors (see below), whose sum is σ = 730296. Its totient is φ = 726880.

The previous prime is 728579. The next prime is 728627. The reversal of 728587 is 785827.

728587 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 brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 785827 = 7 ⋅112261.

It is a cyclic number.

It is not a de Polignac number, because 728587 - 2³ = 728579 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (728527) 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, 387 + ... + 1267.

It is an arithmetic number, because the mean of its divisors is an integer number (182574).

2⁷²⁸⁵⁸⁷ is an apocalyptic number.

728587 is a deficient number, since it is larger than the sum of its proper divisors (1709).

728587 is an equidigital number, since it uses as much as digits as its factorization.

728587 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1708.

The product of its digits is 31360, while the sum is 37.

The square root of 728587 is about 853.5730783009. The cubic root of 728587 is about 89.9830009047.

The spelling of 728587 in words is "seven hundred twenty-eight thousand, five hundred eighty-seven".