216783860 has 24 divisors (see below), whose sum is σ = 462043680. Its totient is φ = 85418784.

The previous prime is 216783859. The next prime is 216783871. The reversal of 216783860 is 68387612.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 79550 + ... + 82229.

It is an arithmetic number, because the mean of its divisors is an integer number (19251820).

Almost surely, 2^216783860 is an apocalyptic number.

216783860 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

216783860 is an abundant number, since it is smaller than the sum of its proper divisors (245259820).

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

216783860 is a wasteful number, since it uses less digits than its factorization.

216783860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161855 (or 161853 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 41.

The square root of 216783860 is about 14723.5817653178. The cubic root of 216783860 is about 600.7249200950.

The spelling of 216783860 in words is "two hundred sixteen million, seven hundred eighty-three thousand, eight hundred sixty".