2181794688 has 192 divisors, whose sum is σ = 6829589520. Its totient is φ = 665763840.

The previous prime is 2181794677. The next prime is 2181794701. The reversal of 2181794688 is 8864971812.

2181794688 is a `hidden beast` number, since 2 + 1 + 8 + 179 + 468 + 8 = 666.

It is a tau number, because it is divible by the number of its divisors (192).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 723103 + ... + 726113.

Almost surely, 2^2181794688 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2181794688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3414794760).

2181794688 is an abundant number, since it is smaller than the sum of its proper divisors (4647794832).

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

2181794688 is a wasteful number, since it uses less digits than its factorization.

2181794688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3085 (or 3070 counting only the distinct ones).

The product of its digits is 1548288, while the sum is 54.

The square root of 2181794688 is about 46709.6851627155. The cubic root of 2181794688 is about 1296.9939791189.

The spelling of 2181794688 in words is "two billion, one hundred eighty-one million, seven hundred ninety-four thousand, six hundred eighty-eight".