72217617 has 8 divisors (see below), whose sum is σ = 97190496. Its totient is φ = 47694912.

The previous prime is 72217601. The next prime is 72217619. The reversal of 72217617 is 71671227.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 72217617 - 2⁴ = 72217601 is a prime.

It is not an unprimeable number, because it can be changed into a prime (72217619) 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, 112168 + ... + 112809.

It is an arithmetic number, because the mean of its divisors is an integer number (12148812).

Almost surely, 2^72217617 is an apocalyptic number.

It is an amenable number.

72217617 is a deficient number, since it is larger than the sum of its proper divisors (24972879).

72217617 is a wasteful number, since it uses less digits than its factorization.

72217617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225087.

The product of its digits is 8232, while the sum is 33.

The square root of 72217617 is about 8498.0949041535. The cubic root of 72217617 is about 416.4354741616.

The spelling of 72217617 in words is "seventy-two million, two hundred seventeen thousand, six hundred seventeen".