2178138996 has 72 divisors (see below), whose sum is σ = 6032863200. Its totient is φ = 657132480.

The previous prime is 2178138983. The next prime is 2178138997. The reversal of 2178138996 is 6998318712.

2178138996 is a `hidden beast` number, since 2 + 178 + 1 + 389 + 96 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2178138997) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 78675 + ... + 102693.

Almost surely, 2^2178138996 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 2178138996, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3016431600).

2178138996 is an abundant number, since it is smaller than the sum of its proper divisors (3854724204).

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

2178138996 is a wasteful number, since it uses less digits than its factorization.

2178138996 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24269 (or 24264 counting only the distinct ones).

The product of its digits is 1306368, while the sum is 54.

The square root of 2178138996 is about 46670.5367014351. The cubic root of 2178138996 is about 1296.2691841976.

The spelling of 2178138996 in words is "two billion, one hundred seventy-eight million, one hundred thirty-eight thousand, nine hundred ninety-six".