2181488178 has 48 divisors (see below), whose sum is σ = 4643077824. Its totient is φ = 683155200.

The previous prime is 2181488159. The next prime is 2181488203. The reversal of 2181488178 is 8718841812.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

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 23 ways as a sum of consecutive naturals, for example, 1676128 + ... + 1677428.

It is an arithmetic number, because the mean of its divisors is an integer number (96730788).

Almost surely, 2^2181488178 is an apocalyptic number.

2181488178 is an abundant number, since it is smaller than the sum of its proper divisors (2461589646).

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

2181488178 is a wasteful number, since it uses less digits than its factorization.

2181488178 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2307 (or 2290 counting only the distinct ones).

The product of its digits is 229376, while the sum is 48.

The square root of 2181488178 is about 46706.4040362775. The cubic root of 2181488178 is about 1296.9332400945.

The spelling of 2181488178 in words is "two billion, one hundred eighty-one million, four hundred eighty-eight thousand, one hundred seventy-eight".