217288996 has 12 divisors (see below), whose sum is σ = 393368220. Its totient is φ = 104898080.

The previous prime is 217288991. The next prime is 217289003. The reversal of 217288996 is 699882712.

It can be written as a sum of positive squares in 2 ways, for example, as 177422400 + 39866596 = 13320^2 + 6314^2 .

It is not an unprimeable number, because it can be changed into a prime (217288991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 936475 + ... + 936706.

It is an arithmetic number, because the mean of its divisors is an integer number (32780685).

Almost surely, 2^217288996 is an apocalyptic number.

It is an amenable number.

217288996 is a deficient number, since it is larger than the sum of its proper divisors (176079224).

217288996 is a wasteful number, since it uses less digits than its factorization.

217288996 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1873214 (or 1873212 counting only the distinct ones).

The product of its digits is 870912, while the sum is 52.

The square root of 217288996 is about 14740.7257623226. The cubic root of 217288996 is about 601.1911485253.

The spelling of 217288996 in words is "two hundred seventeen million, two hundred eighty-eight thousand, nine hundred ninety-six".