216766 has 16 divisors (see below), whose sum is σ = 362880. Its totient is φ = 96280.

The previous prime is 216761. The next prime is 216779. The reversal of 216766 is 667612.

216766 = T₁₉₃ + T₁₉₄ + ... + T₂₀₃.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216761) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1215 + ... + 1381.

It is an arithmetic number, because the mean of its divisors is an integer number (22680).

2²¹⁶⁷⁶⁶ is an apocalyptic number.

216766 is a deficient number, since it is larger than the sum of its proper divisors (146114).

216766 is a wasteful number, since it uses less digits than its factorization.

216766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 239.

The product of its digits is 3024, while the sum is 28.

The square root of 216766 is about 465.5813570151. The cubic root of 216766 is about 60.0708422493.

The spelling of 216766 in words is "two hundred sixteen thousand, seven hundred sixty-six".