216400327808 has 32 divisors (see below), whose sum is σ = 492697176960. Its totient is φ = 92742997248.

The previous prime is 216400327747. The next prime is 216400327817. The reversal of 216400327808 is 808723004612.

It is a tau number, because it is divible by the number of its divisors (32).

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, 120758216 + ... + 120760007.

It is an arithmetic number, because the mean of its divisors is an integer number (15396786780).

Almost surely, 2^216400327808 is an apocalyptic number.

216400327808 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

216400327808 is an abundant number, since it is smaller than the sum of its proper divisors (276296849152).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

216400327808 is an equidigital number, since it uses as much as digits as its factorization.

216400327808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 241518244 (or 241518232 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 41.

The spelling of 216400327808 in words is "two hundred sixteen billion, four hundred million, three hundred twenty-seven thousand, eight hundred eight".