216849890 has 8 divisors (see below), whose sum is σ = 390329820. Its totient is φ = 86739952.

The previous prime is 216849889. The next prime is 216849949. The reversal of 216849890 is 98948612.

It can be written as a sum of positive squares in 2 ways, for example, as 183683809 + 33166081 = 13553^2 + 5759^2 .

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

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 3 ways as a sum of consecutive naturals, for example, 10842485 + ... + 10842504.

Almost surely, 2^216849890 is an apocalyptic number.

216849890 is a deficient number, since it is larger than the sum of its proper divisors (173479930).

216849890 is a wasteful number, since it uses less digits than its factorization.

216849890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21684996.

The product of its (nonzero) digits is 248832, while the sum is 47.

The square root of 216849890 is about 14725.8239158290. The cubic root of 216849890 is about 600.7859053238.

The spelling of 216849890 in words is "two hundred sixteen million, eight hundred forty-nine thousand, eight hundred ninety".