222728732738 has 6 divisors (see below), whose sum is σ = 334094100249. Its totient is φ = 111364032656.

The previous prime is 222728732731. The next prime is 222728732767. The reversal of 222728732738 is 837237827222.

It is a happy number.

222728732738 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 132828904849 + 89899827889 = 364457^2 + 299833^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=333713.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 222728732738.

It is not an unprimeable number, because it can be changed into a prime (222728732731) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 500570 + ... + 834282.

Almost surely, 2^222728732738 is an apocalyptic number.

222728732738 is a deficient number, since it is larger than the sum of its proper divisors (111365367511).

222728732738 is an frugal number, since it uses more digits than its factorization.

222728732738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 667428 (or 333715 counting only the distinct ones).

The product of its digits is 6322176, while the sum is 53.

The spelling of 222728732738 in words is "two hundred twenty-two billion, seven hundred twenty-eight million, seven hundred thirty-two thousand, seven hundred thirty-eight".