216730816 has 14 divisors (see below), whose sum is σ = 430075340. Its totient is φ = 108365376.

The previous prime is 216730799. The next prime is 216730819. The reversal of 216730816 is 618037612.

It is not an unprimeable number, because it can be changed into a prime (216730819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1693146 + ... + 1693273.

Almost surely, 2^216730816 is an apocalyptic number.

It is an amenable number.

216730816 is a deficient number, since it is larger than the sum of its proper divisors (213344524).

216730816 is an equidigital number, since it uses as much as digits as its factorization.

216730816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3386431 (or 3386421 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 216730816 is about 14721.7803271208. The cubic root of 216730816 is about 600.6759197497.

The spelling of 216730816 in words is "two hundred sixteen million, seven hundred thirty thousand, eight hundred sixteen".