72217817 has 12 divisors (see below), whose sum is σ = 86720256. Its totient is φ = 59902920.

The previous prime is 72217813. The next prime is 72217823. The reversal of 72217817 is 71871227.

It is not a de Polignac number, because 72217817 - 2² = 72217813 is a prime.

It is not an unprimeable number, because it can be changed into a prime (72217813) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 22253 + ... + 25290.

It is an arithmetic number, because the mean of its divisors is an integer number (7226688).

Almost surely, 2^72217817 is an apocalyptic number.

It is an amenable number.

72217817 is a deficient number, since it is larger than the sum of its proper divisors (14502439).

72217817 is a wasteful number, since it uses less digits than its factorization.

72217817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47588 (or 47581 counting only the distinct ones).

The product of its digits is 10976, while the sum is 35.

The square root of 72217817 is about 8498.1066714887. The cubic root of 72217817 is about 416.4358585877.

The spelling of 72217817 in words is "seventy-two million, two hundred seventeen thousand, eight hundred seventeen".