728663825 has 6 divisors (see below), whose sum is σ = 903543174. Its totient is φ = 582931040.

The previous prime is 728663821. The next prime is 728663833. The reversal of 728663825 is 528366827.

It is a happy number.

728663825 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 124634896 + 604028929 = 11164^2 + 24577^2 .

It is not a de Polignac number, because 728663825 - 2² = 728663821 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 728663825.

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 5 ways as a sum of consecutive naturals, for example, 14573252 + ... + 14573301.

It is an arithmetic number, because the mean of its divisors is an integer number (150590529).

Almost surely, 2^728663825 is an apocalyptic number.

It is an amenable number.

728663825 is a deficient number, since it is larger than the sum of its proper divisors (174879349).

728663825 is a wasteful number, since it uses less digits than its factorization.

728663825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29146563 (or 29146558 counting only the distinct ones).

The product of its digits is 967680, while the sum is 47.

The square root of 728663825 is about 26993.7738191606. The cubic root of 728663825 is about 899.8616351076.

The spelling of 728663825 in words is "seven hundred twenty-eight million, six hundred sixty-three thousand, eight hundred twenty-five".