728225 has 6 divisors (see below), whose sum is σ = 903030. Its totient is φ = 582560.

The previous prime is 728209. The next prime is 728261. The reversal of 728225 is 522827.

It can be written as a sum of positive squares in 3 ways, for example, as 10816 + 717409 = 104^2 + 847^2 .

It is not a de Polignac number, because 728225 - 2⁴ = 728209 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 728194 and 728203.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 14540 + ... + 14589.

It is an arithmetic number, because the mean of its divisors is an integer number (150505).

2⁷²⁸²²⁵ is an apocalyptic number.

It is an amenable number.

728225 is a deficient number, since it is larger than the sum of its proper divisors (174805).

728225 is a wasteful number, since it uses less digits than its factorization.

728225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29139 (or 29134 counting only the distinct ones).

The product of its digits is 2240, while the sum is 26.

The square root of 728225 is about 853.3610021556. The cubic root of 728225 is about 89.9680956874.

It can be divided in two parts, 72822 and 5, that added together give a palindrome (72827).

The spelling of 728225 in words is "seven hundred twenty-eight thousand, two hundred twenty-five".