217308268 has 12 divisors (see below), whose sum is σ = 387465120. Its totient is φ = 106603952.

The previous prime is 217308251. The next prime is 217308319. The reversal of 217308268 is 862803712.

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 3 ways as a sum of consecutive naturals, for example, 512308 + ... + 512731.

It is an arithmetic number, because the mean of its divisors is an integer number (32288760).

Almost surely, 2^217308268 is an apocalyptic number.

It is an amenable number.

217308268 is a deficient number, since it is larger than the sum of its proper divisors (170156852).

217308268 is a wasteful number, since it uses less digits than its factorization.

217308268 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1025096 (or 1025094 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 37.

The square root of 217308268 is about 14741.3794469853. The cubic root of 217308268 is about 601.2089218034.

The spelling of 217308268 in words is "two hundred seventeen million, three hundred eight thousand, two hundred sixty-eight".