725208689 has 4 divisors (see below), whose sum is σ = 729551424. Its totient is φ = 720865956.

The previous prime is 725208647. The next prime is 725208691. The reversal of 725208689 is 986802527.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-725208689 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (725208619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2171117 + ... + 2171450.

It is an arithmetic number, because the mean of its divisors is an integer number (182387856).

Almost surely, 2^725208689 is an apocalyptic number.

It is an amenable number.

725208689 is a deficient number, since it is larger than the sum of its proper divisors (4342735).

725208689 is a wasteful number, since it uses less digits than its factorization.

725208689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4342734.

The product of its (nonzero) digits is 483840, while the sum is 47.

The square root of 725208689 is about 26929.6990142853. The cubic root of 725208689 is about 898.4370771410.

The spelling of 725208689 in words is "seven hundred twenty-five million, two hundred eight thousand, six hundred eighty-nine".