2178843816 has 32 divisors (see below), whose sum is σ = 5448945600. Its totient is φ = 726036480.

The previous prime is 2178843809. The next prime is 2178843817. The reversal of 2178843816 is 6183488712.

It is not an unprimeable number, because it can be changed into a prime (2178843817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66261 + ... + 93531.

It is an arithmetic number, because the mean of its divisors is an integer number (170279550).

Almost surely, 2^2178843816 is an apocalyptic number.

It is an amenable number.

2178843816 is an abundant number, since it is smaller than the sum of its proper divisors (3270101784).

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

2178843816 is a wasteful number, since it uses less digits than its factorization.

2178843816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30609 (or 30605 counting only the distinct ones).

The product of its digits is 516096, while the sum is 48.

The square root of 2178843816 is about 46678.0871073355. The cubic root of 2178843816 is about 1296.4089882411.

The spelling of 2178843816 in words is "two billion, one hundred seventy-eight million, eight hundred forty-three thousand, eight hundred sixteen".