216686850 has 48 divisors (see below), whose sum is σ = 538278048. Its totient is φ = 57687040.

The previous prime is 216686831. The next prime is 216686857. The reversal of 216686850 is 58686612.

216686850 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (216686857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 177442 + ... + 178658.

It is an arithmetic number, because the mean of its divisors is an integer number (11214126).

Almost surely, 2^216686850 is an apocalyptic number.

216686850 is an abundant number, since it is smaller than the sum of its proper divisors (321591198).

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

216686850 is a wasteful number, since it uses less digits than its factorization.

216686850 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2419 (or 2414 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 42.

The square root of 216686850 is about 14720.2870216582. The cubic root of 216686850 is about 600.6352993095.

The spelling of 216686850 in words is "two hundred sixteen million, six hundred eighty-six thousand, eight hundred fifty".