216739990 has 8 divisors (see below), whose sum is σ = 390132000. Its totient is φ = 86695992.

The previous prime is 216739967. The next prime is 216740033. The reversal of 216739990 is 99937612.

216739990 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a self number, because there is not a number n which added to its sum of digits gives 216739990.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10836990 + ... + 10837009.

It is an arithmetic number, because the mean of its divisors is an integer number (48766500).

Almost surely, 2^216739990 is an apocalyptic number.

216739990 is a deficient number, since it is larger than the sum of its proper divisors (173392010).

216739990 is a wasteful number, since it uses less digits than its factorization.

216739990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21674006.

The product of its (nonzero) digits is 183708, while the sum is 46.

The square root of 216739990 is about 14722.0919029872. The cubic root of 216739990 is about 600.6843949683.

The spelling of 216739990 in words is "two hundred sixteen million, seven hundred thirty-nine thousand, nine hundred ninety".