725570 has 24 divisors (see below), whose sum is σ = 1367604. Its totient is φ = 277056.

The previous prime is 725537. The next prime is 725579. The reversal of 725570 is 75527.

725570 = 90² + 91² + ... + 142².

It can be written as a sum of positive squares in 6 ways, for example, as 667489 + 58081 = 817^2 + 241^2 .

It is not an unprimeable number, because it can be changed into a prime (725579) 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 11 ways as a sum of consecutive naturals, for example, 13664 + ... + 13716.

2⁷²⁵⁵⁷⁰ is an apocalyptic number.

725570 is a deficient number, since it is larger than the sum of its proper divisors (642034).

725570 is a wasteful number, since it uses less digits than its factorization.

725570 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134 (or 97 counting only the distinct ones).

The product of its (nonzero) digits is 2450, while the sum is 26.

The square root of 725570 is about 851.8039680584. The cubic root of 725570 is about 89.8586257788.

The spelling of 725570 in words is "seven hundred twenty-five thousand, five hundred seventy".