216835668 has 72 divisors (see below), whose sum is σ = 648036480. Its totient is φ = 59814720.

The previous prime is 216835649. The next prime is 216835673. The reversal of 216835668 is 866538612.

216835668 is a `hidden beast` number, since 2 + 1 + 6 + 83 + 566 + 8 = 666.

216835668 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7528 + ... + 22143.

Almost surely, 2^216835668 is an apocalyptic number.

216835668 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

216835668 is an abundant number, since it is smaller than the sum of its proper divisors (431200812).

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

216835668 is a wasteful number, since it uses less digits than its factorization.

216835668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29717 (or 29712 counting only the distinct ones).

The product of its digits is 414720, while the sum is 45.

The square root of 216835668 is about 14725.3410147270. The cubic root of 216835668 is about 600.7727709478.

The spelling of 216835668 in words is "two hundred sixteen million, eight hundred thirty-five thousand, six hundred sixty-eight".