217401568 has 24 divisors (see below), whose sum is σ = 433171368. Its totient is φ = 107389824.

The previous prime is 217401563. The next prime is 217401577. The reversal of 217401568 is 865104712.

217401568 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (217401563) 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, 38271 + ... + 43582.

It is an arithmetic number, because the mean of its divisors is an integer number (18048807).

Almost surely, 2^217401568 is an apocalyptic number.

It is an amenable number.

217401568 is a deficient number, since it is larger than the sum of its proper divisors (215769800).

217401568 is an equidigital number, since it uses as much as digits as its factorization.

217401568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81946 (or 81938 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 34.

The square root of 217401568 is about 14744.5436687610. The cubic root of 217401568 is about 601.2949513060.

The spelling of 217401568 in words is "two hundred seventeen million, four hundred one thousand, five hundred sixty-eight".