72247887938 has 6 divisors (see below), whose sum is σ = 108372402099. Its totient is φ = 36123753906.

The previous prime is 72247887931. The next prime is 72247887967. The reversal of 72247887938 is 83978874227.

It can be written as a sum of positive squares in only one way, i.e., 36123943969 + 36123943969 = 190063^2 + 190063^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=190063.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (72247887931) 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, 285095 + ... + 475157.

Almost surely, 2^72247887938 is an apocalyptic number.

72247887938 is a deficient number, since it is larger than the sum of its proper divisors (36124514161).

72247887938 is an frugal number, since it uses more digits than its factorization.

72247887938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 380128 (or 190065 counting only the distinct ones).

The product of its digits is 75866112, while the sum is 65.

The spelling of 72247887938 in words is "seventy-two billion, two hundred forty-seven million, eight hundred eighty-seven thousand, nine hundred thirty-eight".