728663366828 has 24 divisors (see below), whose sum is σ = 1278483832080. Its totient is φ = 363382476800.

The previous prime is 728663366819. The next prime is 728663366887. The reversal of 728663366828 is 828663366827.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18553100 + ... + 18592332.

It is an arithmetic number, because the mean of its divisors is an integer number (53270159670).

Almost surely, 2^728663366828 is an apocalyptic number.

It is an amenable number.

728663366828 is a deficient number, since it is larger than the sum of its proper divisors (549820465252).

728663366828 is a wasteful number, since it uses less digits than its factorization.

728663366828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51217 (or 51215 counting only the distinct ones).

The product of its digits is 167215104, while the sum is 65.

Subtracting 728663366828 from its reverse (828663366827), we obtain a palindrome (99999999999).

The spelling of 728663366828 in words is "seven hundred twenty-eight billion, six hundred sixty-three million, three hundred sixty-six thousand, eight hundred twenty-eight".