2168117720 has 64 divisors (see below), whose sum is σ = 5169679200. Its totient is φ = 816901120.

The previous prime is 2168117687. The next prime is 2168117767. The reversal of 2168117720 is 277118612.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24767 + ... + 70353.

Almost surely, 2^2168117720 is an apocalyptic number.

2168117720 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 2168117720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2584839600).

2168117720 is an abundant number, since it is smaller than the sum of its proper divisors (3001561480).

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

2168117720 is a wasteful number, since it uses less digits than its factorization.

2168117720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45668 (or 45664 counting only the distinct ones).

The product of its (nonzero) digits is 9408, while the sum is 35.

The square root of 2168117720 is about 46563.0510168739. The cubic root of 2168117720 is about 1294.2781505010.

The spelling of 2168117720 in words is "two billion, one hundred sixty-eight million, one hundred seventeen thousand, seven hundred twenty".