216690286 has 4 divisors (see below), whose sum is σ = 325035432. Its totient is φ = 108345142.

The previous prime is 216690283. The next prime is 216690311. The reversal of 216690286 is 682096612.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216690283) 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 as a sum of consecutive naturals, namely, 54172570 + ... + 54172573.

It is an arithmetic number, because the mean of its divisors is an integer number (81258858).

Almost surely, 2^216690286 is an apocalyptic number.

216690286 is a deficient number, since it is larger than the sum of its proper divisors (108345146).

216690286 is a wasteful number, since it uses less digits than its factorization.

216690286 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108345145.

The product of its (nonzero) digits is 62208, while the sum is 40.

The square root of 216690286 is about 14720.4037308764. The cubic root of 216690286 is about 600.6384740475.

The spelling of 216690286 in words is "two hundred sixteen million, six hundred ninety thousand, two hundred eighty-six".