725681489 has 16 divisors (see below), whose sum is σ = 795453120. Its totient is φ = 657961920.

The previous prime is 725681483. The next prime is 725681503. The reversal of 725681489 is 984186527.

It is a cyclic number.

It is not a de Polignac number, because 725681489 - 2⁸ = 725681233 is a prime.

It is a super-2 number, since 2×725681489² = 1053227246954514242, which contains 22 as substring.

It is a Smith number, since the sum of its digits (50) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (725681483) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 365702 + ... + 367680.

It is an arithmetic number, because the mean of its divisors is an integer number (49715820).

Almost surely, 2^725681489 is an apocalyptic number.

It is an amenable number.

725681489 is a deficient number, since it is larger than the sum of its proper divisors (69771631).

725681489 is a wasteful number, since it uses less digits than its factorization.

725681489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2480.

The product of its digits is 967680, while the sum is 50.

The square root of 725681489 is about 26938.4759962400. The cubic root of 725681489 is about 898.6322801577.

The spelling of 725681489 in words is "seven hundred twenty-five million, six hundred eighty-one thousand, four hundred eighty-nine".