728425 has 6 divisors (see below), whose sum is σ = 903278. Its totient is φ = 582720.

The previous prime is 728423. The next prime is 728437. The reversal of 728425 is 524827.

728425 = 603² + 604².

It can be written as a sum of positive squares in 3 ways, for example, as 168921 + 559504 = 411^2 + 748^2 .

It is not a de Polignac number, because 728425 - 2¹ = 728423 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 728393 and 728402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (728423) 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 5 ways as a sum of consecutive naturals, for example, 14544 + ... + 14593.

2⁷²⁸⁴²⁵ is an apocalyptic number.

728425 is the 604-th centered square number.

It is an amenable number.

728425 is a deficient number, since it is larger than the sum of its proper divisors (174853).

728425 is a wasteful number, since it uses less digits than its factorization.

728425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29147 (or 29142 counting only the distinct ones).

The product of its digits is 4480, while the sum is 28.

The square root of 728425 is about 853.4781778112. The cubic root of 728425 is about 89.9763312245.

The spelling of 728425 in words is "seven hundred twenty-eight thousand, four hundred twenty-five".