13821018728 has 32 divisors (see below), whose sum is σ = 28416778560. Its totient is φ = 6249722880.

The previous prime is 13821018721. The next prime is 13821018749. The reversal of 13821018728 is 82781012831.

It is not an unprimeable number, because it can be changed into a prime (13821018721) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 389900 + ... + 423867.

It is an arithmetic number, because the mean of its divisors is an integer number (888024330).

Almost surely, 2^13821018728 is an apocalyptic number.

It is an amenable number.

13821018728 is an abundant number, since it is smaller than the sum of its proper divisors (14595759832).

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

13821018728 is a wasteful number, since it uses less digits than its factorization.

13821018728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 813977 (or 813973 counting only the distinct ones).

The product of its (nonzero) digits is 43008, while the sum is 41.

The spelling of 13821018728 in words is "thirteen billion, eight hundred twenty-one million, eighteen thousand, seven hundred twenty-eight".