725656728 has 64 divisors (see below), whose sum is σ = 1876896000. Its totient is φ = 233615232.

The previous prime is 725656727. The next prime is 725656751. The reversal of 725656728 is 827656527.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (725656727) 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, 120493 + ... + 126371.

It is an arithmetic number, because the mean of its divisors is an integer number (29326500).

Almost surely, 2^725656728 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 725656728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (938448000).

725656728 is an abundant number, since it is smaller than the sum of its proper divisors (1151239272).

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

725656728 is a wasteful number, since it uses less digits than its factorization.

725656728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6064 (or 6060 counting only the distinct ones).

The product of its digits is 1411200, while the sum is 48.

The square root of 725656728 is about 26938.0164080431. The cubic root of 725656728 is about 898.6220592884.

The spelling of 725656728 in words is "seven hundred twenty-five million, six hundred fifty-six thousand, seven hundred twenty-eight".