216866768 has 20 divisors (see below), whose sum is σ = 431536740. Its totient is φ = 105502464.

The previous prime is 216866743. The next prime is 216866777. The reversal of 216866768 is 867668612.

It is a happy number.

216866768 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 2 ways, for example, as 174979984 + 41886784 = 13228^2 + 6472^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 182573 + ... + 183756.

It is an arithmetic number, because the mean of its divisors is an integer number (21576837).

Almost surely, 2^216866768 is an apocalyptic number.

It is an amenable number.

216866768 is a deficient number, since it is larger than the sum of its proper divisors (214669972).

216866768 is a wasteful number, since it uses less digits than its factorization.

216866768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 366374 (or 366368 counting only the distinct ones).

The product of its digits is 1161216, while the sum is 50.

The square root of 216866768 is about 14726.3969795738. The cubic root of 216866768 is about 600.8014918376.

The spelling of 216866768 in words is "two hundred sixteen million, eight hundred sixty-six thousand, seven hundred sixty-eight".