72217946 has 8 divisors (see below), whose sum is σ = 112062420. Its totient is φ = 34863808.

The previous prime is 72217909. The next prime is 72217967. The reversal of 72217946 is 64971227.

It can be written as a sum of positive squares in 2 ways, for example, as 65431921 + 6786025 = 8089^2 + 2605^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 622511 + ... + 622626.

Almost surely, 2^72217946 is an apocalyptic number.

72217946 is a deficient number, since it is larger than the sum of its proper divisors (39844474).

72217946 is a wasteful number, since it uses less digits than its factorization.

72217946 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1245168.

The product of its digits is 42336, while the sum is 38.

The square root of 72217946 is about 8498.1142614112. The cubic root of 72217946 is about 416.4361065422.

The spelling of 72217946 in words is "seventy-two million, two hundred seventeen thousand, nine hundred forty-six".