725587809 has 4 divisors (see below), whose sum is σ = 967450416. Its totient is φ = 483725204.

The previous prime is 725587787. The next prime is 725587813. The reversal of 725587809 is 908785527.

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 not a de Polignac number, because 725587809 - 2⁹ = 725587297 is a prime.

It is not an unprimeable number, because it can be changed into a prime (725580809) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 120931299 + ... + 120931304.

It is an arithmetic number, because the mean of its divisors is an integer number (241862604).

Almost surely, 2^725587809 is an apocalyptic number.

It is an amenable number.

725587809 is a deficient number, since it is larger than the sum of its proper divisors (241862607).

725587809 is a wasteful number, since it uses less digits than its factorization.

725587809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241862606.

The product of its (nonzero) digits is 1411200, while the sum is 51.

The square root of 725587809 is about 26936.7371632126. The cubic root of 725587809 is about 898.5936096132.

The spelling of 725587809 in words is "seven hundred twenty-five million, five hundred eighty-seven thousand, eight hundred nine".