728756224 has 78 divisors (see below), whose sum is σ = 1695733584. Its totient is φ = 312238080.

The previous prime is 728756183. The next prime is 728756269. The reversal of 728756224 is 422657827.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 198889 + ... + 202519.

Almost surely, 2^728756224 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 728756224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (847866792).

728756224 is an abundant number, since it is smaller than the sum of its proper divisors (966977360).

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

728756224 is an equidigital number, since it uses as much as digits as its factorization.

728756224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3669 (or 3640 counting only the distinct ones).

The product of its digits is 376320, while the sum is 43.

The square root of 728756224 is about 26995.4852521676. The cubic root of 728756224 is about 899.8996694742.

The spelling of 728756224 in words is "seven hundred twenty-eight million, seven hundred fifty-six thousand, two hundred twenty-four".