728663826 has 64 divisors (see below), whose sum is σ = 1702477440. Its totient is φ = 205455360.

The previous prime is 728663821. The next prime is 728663833. The reversal of 728663826 is 628366827.

It is a happy number.

728663826 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (728663821) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 96210 + ... + 103506.

It is an arithmetic number, because the mean of its divisors is an integer number (26601210).

Almost surely, 2^728663826 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 728663826, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (851238720).

728663826 is an abundant number, since it is smaller than the sum of its proper divisors (973813614).

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

728663826 is a wasteful number, since it uses less digits than its factorization.

728663826 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7419.

The product of its digits is 1161216, while the sum is 48.

The square root of 728663826 is about 26993.7738376834. The cubic root of 728663826 is about 899.8616355193.

The spelling of 728663826 in words is "seven hundred twenty-eight million, six hundred sixty-three thousand, eight hundred twenty-six".