2178344860 has 48 divisors (see below), whose sum is σ = 4743113760. Its totient is φ = 839363840.

The previous prime is 2178344843. The next prime is 2178344899. The reversal of 2178344860 is 684438712.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 263307 + ... + 271453.

It is an arithmetic number, because the mean of its divisors is an integer number (98814870).

Almost surely, 2^2178344860 is an apocalyptic number.

2178344860 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2178344860, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2371556880).

2178344860 is an abundant number, since it is smaller than the sum of its proper divisors (2564768900).

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

2178344860 is a wasteful number, since it uses less digits than its factorization.

2178344860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8646 (or 8644 counting only the distinct ones).

The product of its (nonzero) digits is 258048, while the sum is 43.

The square root of 2178344860 is about 46672.7421521384. The cubic root of 2178344860 is about 1296.3100213148.

The spelling of 2178344860 in words is "two billion, one hundred seventy-eight million, three hundred forty-four thousand, eight hundred sixty".