216710986 has 8 divisors (see below), whose sum is σ = 325128960. Its totient is φ = 108334668.

The previous prime is 216710981. The next prime is 216710999. The reversal of 216710986 is 689017612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (216710981) 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, 14935 + ... + 25621.

It is an arithmetic number, because the mean of its divisors is an integer number (40641120).

Almost surely, 2^216710986 is an apocalyptic number.

216710986 is a deficient number, since it is larger than the sum of its proper divisors (108417974).

216710986 is a wasteful number, since it uses less digits than its factorization.

216710986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20828.

The product of its (nonzero) digits is 36288, while the sum is 40.

The square root of 216710986 is about 14721.1068198013. The cubic root of 216710986 is about 600.6575993788.

The spelling of 216710986 in words is "two hundred sixteen million, seven hundred ten thousand, nine hundred eighty-six".