728485 has 8 divisors (see below), whose sum is σ = 891000. Its totient is φ = 571584.

The previous prime is 728477. The next prime is 728489. The reversal of 728485 is 584827.

It can be written as a sum of positive squares in 4 ways, for example, as 34596 + 693889 = 186^2 + 833^2 .

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 728485 - 2³ = 728477 is a prime.

728485 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 728485.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (728489) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1110 + ... + 1639.

It is an arithmetic number, because the mean of its divisors is an integer number (111375).

2⁷²⁸⁴⁸⁵ is an apocalyptic number.

It is an amenable number.

728485 is a deficient number, since it is larger than the sum of its proper divisors (162515).

728485 is a wasteful number, since it uses less digits than its factorization.

728485 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2807.

The product of its digits is 17920, while the sum is 34.

The square root of 728485 is about 853.5133273710. The cubic root of 728485 is about 89.9788015917.

The spelling of 728485 in words is "seven hundred twenty-eight thousand, four hundred eighty-five".