728285 has 8 divisors (see below), whose sum is σ = 882360. Its totient is φ = 577024.

The previous prime is 728281. The next prime is 728293. The reversal of 728285 is 582827.

It can be written as a sum of positive squares in 4 ways, for example, as 19321 + 708964 = 139^2 + 842^2 .

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 728285 - 2² = 728281 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (728281) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 80 + ... + 1209.

It is an arithmetic number, because the mean of its divisors is an integer number (110295).

2⁷²⁸²⁸⁵ is an apocalyptic number.

It is an amenable number.

728285 is a deficient number, since it is larger than the sum of its proper divisors (154075).

728285 is a wasteful number, since it uses less digits than its factorization.

728285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1407.

The product of its digits is 8960, while the sum is 32.

The square root of 728285 is about 853.3961565416. The cubic root of 728285 is about 89.9705665068.

The spelling of 728285 in words is "seven hundred twenty-eight thousand, two hundred eighty-five".