216766729 has 3 divisors (see below), whose sum is σ = 216781453. Its totient is φ = 216752006.

The previous prime is 216766723. The next prime is 216766769. The reversal of 216766729 is 927667612.

The square root of 216766729 is 14723.

It is a perfect power (a square), and thus also a powerful number.

216766729 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 216766729 - 2³ = 216766721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216766721) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 7362 + ... + 22084.

Almost surely, 2^216766729 is an apocalyptic number.

216766729 is the 14723-rd square number.

216766729 is the 7362-nd centered octagonal number.

It is an amenable number.

216766729 is a deficient number, since it is larger than the sum of its proper divisors (14724).

216766729 is an frugal number, since it uses more digits than its factorization.

216766729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29446 (or 14723 counting only the distinct ones).

The product of its digits is 381024, while the sum is 46.

The cubic root of 216766729 is about 600.7090959008.

The spelling of 216766729 in words is "two hundred sixteen million, seven hundred sixty-six thousand, seven hundred twenty-nine".