72217766444 has 24 divisors (see below), whose sum is σ = 134253226800. Its totient is φ = 33894573120.

The previous prime is 72217766429. The next prime is 72217766449. The reversal of 72217766444 is 44466771227.

It is a junction number, because it is equal to n+sod(n) for n = 72217766392 and 72217766401.

It is not an unprimeable number, because it can be changed into a prime (72217766449) 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, 4350587 + ... + 4367154.

It is an arithmetic number, because the mean of its divisors is an integer number (5593884450).

Almost surely, 2^72217766444 is an apocalyptic number.

It is an amenable number.

72217766444 is a deficient number, since it is larger than the sum of its proper divisors (62035460356).

72217766444 is a wasteful number, since it uses less digits than its factorization.

72217766444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8717873 (or 8717871 counting only the distinct ones).

The product of its digits is 3161088, while the sum is 50.

The spelling of 72217766444 in words is "seventy-two billion, two hundred seventeen million, seven hundred sixty-six thousand, four hundred forty-four".