725728896 has 80 divisors (see below), whose sum is σ = 2159788290. Its totient is φ = 241906176.

The previous prime is 725728831. The next prime is 725728907. The reversal of 725728896 is 698827527.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 507871296 + 217857600 = 22536^2 + 14760^2 .

It is a Harshad number since it is a multiple of its sum of digits (54).

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 9 ways as a sum of consecutive naturals, for example, 24631 + ... + 45366.

Almost surely, 2^725728896 is an apocalyptic number.

It is an amenable number.

725728896 is an abundant number, since it is smaller than the sum of its proper divisors (1434059394).

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

725728896 is an equidigital number, since it uses as much as digits as its factorization.

725728896 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70023 (or 70002 counting only the distinct ones).

The product of its digits is 3386880, while the sum is 54.

The square root of 725728896 is about 26939.3558943045. The cubic root of 725728896 is about 898.6518482159.

The spelling of 725728896 in words is "seven hundred twenty-five million, seven hundred twenty-eight thousand, eight hundred ninety-six".