216786318 has 16 divisors (see below), whose sum is σ = 495511680. Its totient is φ = 61938936.

The previous prime is 216786307. The next prime is 216786341. The reversal of 216786318 is 813687612.

It is a Harshad number since it is a multiple of its sum of digits (42), and also a Moran number because the ratio is a prime number: 5161579 = 216786318 / (2 + 1 + 6 + 7 + 8 + 6 + 3 + 1 + 8).

It is a self number, because there is not a number n which added to its sum of digits gives 216786318.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 2580748 + ... + 2580831.

It is an arithmetic number, because the mean of its divisors is an integer number (30969480).

Almost surely, 2^216786318 is an apocalyptic number.

216786318 is an abundant number, since it is smaller than the sum of its proper divisors (278725362).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

216786318 is a wasteful number, since it uses less digits than its factorization.

216786318 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5161591.

The product of its digits is 96768, while the sum is 42.

The square root of 216786318 is about 14723.6652366182. The cubic root of 216786318 is about 600.7271905227.

The spelling of 216786318 in words is "two hundred sixteen million, seven hundred eighty-six thousand, three hundred eighteen".