216728430818 has 8 divisors (see below), whose sum is σ = 325138851840. Its totient is φ = 108348813540.

The previous prime is 216728430707. The next prime is 216728430827. The reversal of 216728430818 is 818034827612.

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

It is a super-2 number, since 2×216728430818² (a number of 23 digits) contains 22 as substring.

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, 7683338 + ... + 7711493.

It is an arithmetic number, because the mean of its divisors is an integer number (40642356480).

Almost surely, 2^216728430818 is an apocalyptic number.

216728430818 is a deficient number, since it is larger than the sum of its proper divisors (108410421022).

216728430818 is a wasteful number, since it uses less digits than its factorization.

216728430818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15401872.

The product of its (nonzero) digits is 1032192, while the sum is 50.

The spelling of 216728430818 in words is "two hundred sixteen billion, seven hundred twenty-eight million, four hundred thirty thousand, eight hundred eighteen".