217680896 has 22 divisors (see below), whose sum is σ = 435151260. Its totient is φ = 108839936.

The previous prime is 217680889. The next prime is 217680919. The reversal of 217680896 is 698086712.

It is a zygodrome in base 2.

It is a self number, because there is not a number n which added to its sum of digits gives 217680896.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105266 + ... + 107313.

Almost surely, 2^217680896 is an apocalyptic number.

It is an amenable number.

217680896 is a deficient number, since it is larger than the sum of its proper divisors (217470364).

217680896 is an equidigital number, since it uses as much as digits as its factorization.

217680896 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212599 (or 212581 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 47.

The square root of 217680896 is about 14754.0128778580. The cubic root of 217680896 is about 601.5523653245.

The spelling of 217680896 in words is "two hundred seventeen million, six hundred eighty thousand, eight hundred ninety-six".