216678824 has 8 divisors (see below), whose sum is σ = 406272810. Its totient is φ = 108339408.

The previous prime is 216678799. The next prime is 216678827. The reversal of 216678824 is 428876612.

216678824 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 213685924 + 2992900 = 14618^2 + 1730^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (216678827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13542419 + ... + 13542434.

Almost surely, 2^216678824 is an apocalyptic number.

It is an amenable number.

216678824 is a deficient number, since it is larger than the sum of its proper divisors (189593986).

216678824 is a wasteful number, since it uses less digits than its factorization.

216678824 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27084859 (or 27084855 counting only the distinct ones).

The product of its digits is 258048, while the sum is 44.

The square root of 216678824 is about 14720.0144021669. The cubic root of 216678824 is about 600.6278834488.

The spelling of 216678824 in words is "two hundred sixteen million, six hundred seventy-eight thousand, eight hundred twenty-four".