728663366826 has 24 divisors (see below), whose sum is σ = 1633210995780. Its totient is φ = 234512347776.

The previous prime is 728663366819. The next prime is 728663366887. The reversal of 728663366826 is 628663366827.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 640424070225 + 88239296601 = 800265^2 + 297051^2 .

It is a hoax number, since the sum of its digits (63) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 697952895 + ... + 697953938.

Almost surely, 2^728663366826 is an apocalyptic number.

728663366826 is an abundant number, since it is smaller than the sum of its proper divisors (904547628954).

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

728663366826 is a wasteful number, since it uses less digits than its factorization.

728663366826 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1395906870 (or 1395906867 counting only the distinct ones).

The product of its digits is 125411328, while the sum is 63.

Subtracting from 728663366826 its reverse (628663366827), we obtain a palindrome (99999999999).

The spelling of 728663366826 in words is "seven hundred twenty-eight billion, six hundred sixty-three million, three hundred sixty-six thousand, eight hundred twenty-six".