216727989 has 8 divisors (see below), whose sum is σ = 289444512. Its totient is φ = 144248400.

The previous prime is 216727969. The next prime is 216727993. The reversal of 216727989 is 989727612.

216727989 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 216727989 - 2⁹ = 216727477 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216727949) 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, 57087 + ... + 60764.

It is an arithmetic number, because the mean of its divisors is an integer number (36180564).

Almost surely, 2^216727989 is an apocalyptic number.

It is an amenable number.

216727989 is a deficient number, since it is larger than the sum of its proper divisors (72716523).

216727989 is a wasteful number, since it uses less digits than its factorization.

216727989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118467.

The product of its digits is 762048, while the sum is 51.

The square root of 216727989 is about 14721.6843126050. The cubic root of 216727989 is about 600.6733080334.

The spelling of 216727989 in words is "two hundred sixteen million, seven hundred twenty-seven thousand, nine hundred eighty-nine".