2180117988 has 108 divisors (see below), whose sum is σ = 5849691120. Its totient is φ = 684497952.

The previous prime is 2180117921. The next prime is 2180117999. The reversal of 2180117988 is 8897110812.

It is a happy number.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

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 35 ways as a sum of consecutive naturals, for example, 2949723 + ... + 2950461.

Almost surely, 2^2180117988 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 2180117988, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2924845560).

2180117988 is an abundant number, since it is smaller than the sum of its proper divisors (3669573132).

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

2180117988 is a wasteful number, since it uses less digits than its factorization.

2180117988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1014 (or 990 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 45.

The square root of 2180117988 is about 46691.7336152771. The cubic root of 2180117988 is about 1296.6616491752.

The spelling of 2180117988 in words is "two billion, one hundred eighty million, one hundred seventeen thousand, nine hundred eighty-eight".