725709424 has 20 divisors (see below), whose sum is σ = 1533886200. Its totient is φ = 329867840.

The previous prime is 725709407. The next prime is 725709431. The reversal of 725709424 is 424907527.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2061499 + ... + 2061850.

It is an arithmetic number, because the mean of its divisors is an integer number (76694310).

Almost surely, 2^725709424 is an apocalyptic number.

It is an amenable number.

725709424 is an abundant number, since it is smaller than the sum of its proper divisors (808176776).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

725709424 is a wasteful number, since it uses less digits than its factorization.

725709424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4123368 (or 4123362 counting only the distinct ones).

The product of its (nonzero) digits is 141120, while the sum is 40.

The square root of 725709424 is about 26938.9944875454. The cubic root of 725709424 is about 898.6438109146.

The spelling of 725709424 in words is "seven hundred twenty-five million, seven hundred nine thousand, four hundred twenty-four".