725320 has 16 divisors (see below), whose sum is σ = 1632060. Its totient is φ = 290112.

The previous prime is 725317. The next prime is 725321. The reversal of 725320 is 23527.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 715716 + 9604 = 846^2 + 98^2 .

It is not an unprimeable number, because it can be changed into a prime (725321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9027 + ... + 9106.

2⁷²⁵³²⁰ is an apocalyptic number.

It is an amenable number.

725320 is an abundant number, since it is smaller than the sum of its proper divisors (906740).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

725320 is a wasteful number, since it uses less digits than its factorization.

725320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18144 (or 18140 counting only the distinct ones).

The product of its (nonzero) digits is 420, while the sum is 19.

The square root of 725320 is about 851.6572080362. The cubic root of 725320 is about 89.8483041296.

Adding to 725320 its reverse (23527), we get a palindrome (748847).

The spelling of 725320 in words is "seven hundred twenty-five thousand, three hundred twenty".