2217805812 has 48 divisors (see below), whose sum is σ = 5752615680. Its totient is φ = 738915264.

The previous prime is 2217805787. The next prime is 2217805817. The reversal of 2217805812 is 2185087122.

2217805812 is a `hidden beast` number, since 2 + 2 + 1 + 78 + 0 + 581 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2217805817) 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 15 ways as a sum of consecutive naturals, for example, 323088 + ... + 329880.

It is an arithmetic number, because the mean of its divisors is an integer number (119846160).

Almost surely, 2^2217805812 is an apocalyptic number.

It is an amenable number.

2217805812 is an abundant number, since it is smaller than the sum of its proper divisors (3534809868).

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

2217805812 is a wasteful number, since it uses less digits than its factorization.

2217805812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9829 (or 9821 counting only the distinct ones).

The product of its (nonzero) digits is 17920, while the sum is 36.

The square root of 2217805812 is about 47093.5856778819. The cubic root of 2217805812 is about 1304.0908239962.

The spelling of 2217805812 in words is "two billion, two hundred seventeen million, eight hundred five thousand, eight hundred twelve".