2179809868 has 24 divisors (see below), whose sum is σ = 3881470320. Its totient is φ = 1070857920.

The previous prime is 2179809817. The next prime is 2179809871. The reversal of 2179809868 is 8689089712.

It is an unprimeable number.

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, 242763 + ... + 251581.

It is an arithmetic number, because the mean of its divisors is an integer number (161727930).

Almost surely, 2^2179809868 is an apocalyptic number.

It is an amenable number.

2179809868 is a deficient number, since it is larger than the sum of its proper divisors (1701660452).

2179809868 is a wasteful number, since it uses less digits than its factorization.

2179809868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9897 (or 9895 counting only the distinct ones).

The product of its (nonzero) digits is 3483648, while the sum is 58.

The square root of 2179809868 is about 46688.4339853030. The cubic root of 2179809868 is about 1296.6005597888.

The spelling of 2179809868 in words is "two billion, one hundred seventy-nine million, eight hundred nine thousand, eight hundred sixty-eight".