813821501728 has 24 divisors (see below), whose sum is σ = 1602240127488. Its totient is φ = 406903374144.

The previous prime is 813821501693. The next prime is 813821501729. The reversal of 813821501728 is 827105128318.

It is not an unprimeable number, because it can be changed into a prime (813821501729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1851525 + ... + 2248507.

It is an arithmetic number, because the mean of its divisors is an integer number (66760005312).

Almost surely, 2^813821501728 is an apocalyptic number.

It is an amenable number.

813821501728 is a deficient number, since it is larger than the sum of its proper divisors (788418625760).

813821501728 is a wasteful number, since it uses less digits than its factorization.

813821501728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 461056 (or 461048 counting only the distinct ones).

The product of its (nonzero) digits is 215040, while the sum is 46.

The spelling of 813821501728 in words is "eight hundred thirteen billion, eight hundred twenty-one million, five hundred one thousand, seven hundred twenty-eight".