2168778612 has 144 divisors (see below), whose sum is σ = 6916093632. Its totient is φ = 519966720.

The previous prime is 2168778571. The next prime is 2168778673.

2168778612 is nontrivially palindromic in base 10.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 71188 + ... + 96980.

It is an arithmetic number, because the mean of its divisors is an integer number (48028428).

Almost surely, 2^2168778612 is an apocalyptic number.

2168778612 is a gapful number since it is divisible by the number (22) 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 2168778612, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3458046816).

2168778612 is an abundant number, since it is smaller than the sum of its proper divisors (4747315020).

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

2168778612 is a wasteful number, since it uses less digits than its factorization.

2168778612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25838 (or 25829 counting only the distinct ones).

The product of its digits is 451584, while the sum is 48.

The square root of 2168778612 is about 46570.1472190072. The cubic root of 2168778612 is about 1294.4096456945.

The spelling of 2168778612 in words is "two billion, one hundred sixty-eight million, seven hundred seventy-eight thousand, six hundred twelve".