725530 has 16 divisors (see below), whose sum is σ = 1406664. Its totient is φ = 267840.

The previous prime is 725519. The next prime is 725531. The reversal of 725530 is 35527.

It can be written as a sum of positive squares in 4 ways, for example, as 385641 + 339889 = 621^2 + 583^2 .

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (725531) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2661 + ... + 2920.

2⁷²⁵⁵³⁰ is an apocalyptic number.

725530 is a deficient number, since it is larger than the sum of its proper divisors (681134).

725530 is a wasteful number, since it uses less digits than its factorization.

725530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5601.

The product of its (nonzero) digits is 1050, while the sum is 22.

The square root of 725530 is about 851.7804881541. The cubic root of 725530 is about 89.8569744743.

The spelling of 725530 in words is "seven hundred twenty-five thousand, five hundred thirty".