728175081812 has 12 divisors (see below), whose sum is σ = 1277070618516. Its totient is φ = 363297762240.

The previous prime is 728175081779. The next prime is 728175081817. The reversal of 728175081812 is 218180571827.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 243753513796 + 484421568016 = 493714^2 + 696004^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (728175081817) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 197442593 + ... + 197446280.

It is an arithmetic number, because the mean of its divisors is an integer number (106422551543).

Almost surely, 2^728175081812 is an apocalyptic number.

It is an amenable number.

728175081812 is a deficient number, since it is larger than the sum of its proper divisors (548895536704).

728175081812 is a wasteful number, since it uses less digits than its factorization.

728175081812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 394889338 (or 394889336 counting only the distinct ones).

The product of its (nonzero) digits is 501760, while the sum is 50.

The spelling of 728175081812 in words is "seven hundred twenty-eight billion, one hundred seventy-five million, eighty-one thousand, eight hundred twelve".