216858867 has 4 divisors (see below), whose sum is σ = 289145160. Its totient is φ = 144572576.

The previous prime is 216858827. The next prime is 216858877. The reversal of 216858867 is 768858612.

216858867 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.

It is a cyclic number.

It is not a de Polignac number, because 216858867 - 2¹⁰ = 216857843 is a prime.

It is not an unprimeable number, because it can be changed into a prime (216858827) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36143142 + ... + 36143147.

It is an arithmetic number, because the mean of its divisors is an integer number (72286290).

Almost surely, 2^216858867 is an apocalyptic number.

216858867 is a deficient number, since it is larger than the sum of its proper divisors (72286293).

216858867 is an equidigital number, since it uses as much as digits as its factorization.

216858867 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72286292.

The product of its digits is 1290240, while the sum is 51.

The square root of 216858867 is about 14726.1287173513. The cubic root of 216858867 is about 600.7941955142.

The spelling of 216858867 in words is "two hundred sixteen million, eight hundred fifty-eight thousand, eight hundred sixty-seven".