216587867 has 4 divisors (see below), whose sum is σ = 216722616. Its totient is φ = 216453120.

The previous prime is 216587857. The next prime is 216587873. The reversal of 216587867 is 768785612.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 216587867 - 2⁸ = 216587611 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216587827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64934 + ... + 68187.

It is an arithmetic number, because the mean of its divisors is an integer number (54180654).

Almost surely, 2^216587867 is an apocalyptic number.

216587867 is a deficient number, since it is larger than the sum of its proper divisors (134749).

216587867 is a wasteful number, since it uses less digits than its factorization.

216587867 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134748.

The product of its digits is 1128960, while the sum is 50.

The square root of 216587867 is about 14716.9245088775. The cubic root of 216587867 is about 600.5438282321.

The spelling of 216587867 in words is "two hundred sixteen million, five hundred eighty-seven thousand, eight hundred sixty-seven".