217950668 has 24 divisors (see below), whose sum is σ = 428614368. Its totient is φ = 96218496.

The previous prime is 217950643. The next prime is 217950679. The reversal of 217950668 is 866059712.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 89921 + ... + 92312.

It is an arithmetic number, because the mean of its divisors is an integer number (17858932).

Almost surely, 2^217950668 is an apocalyptic number.

It is an amenable number.

217950668 is a deficient number, since it is larger than the sum of its proper divisors (210663700).

217950668 is a wasteful number, since it uses less digits than its factorization.

217950668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182273 (or 182271 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 44.

The square root of 217950668 is about 14763.1523733923. The cubic root of 217950668 is about 601.8007640817.

The spelling of 217950668 in words is "two hundred seventeen million, nine hundred fifty thousand, six hundred sixty-eight".