217603968 has 32 divisors (see below), whose sum is σ = 578011560. Its totient is φ = 72534528.

The previous prime is 217603963. The next prime is 217604027. The reversal of 217603968 is 869306712.

It is a happy number.

217603968 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (32).

It is a hoax number, since the sum of its digits (42) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (217603963) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 282955 + ... + 283722.

Almost surely, 2^217603968 is an apocalyptic number.

It is an amenable number.

217603968 is an abundant number, since it is smaller than the sum of its proper divisors (360407592).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

217603968 is an equidigital number, since it uses as much as digits as its factorization.

217603968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 566694 (or 566682 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 42.

The square root of 217603968 is about 14751.4056279393. The cubic root of 217603968 is about 601.4814945015.

The spelling of 217603968 in words is "two hundred seventeen million, six hundred three thousand, nine hundred sixty-eight".