2168668720 has 40 divisors (see below), whose sum is σ = 5216027760. Its totient is φ = 837553920.

The previous prime is 2168668717. The next prime is 2168668727. The reversal of 2168668720 is 278668612.

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (2168668727) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 465066 + ... + 469705.

It is an arithmetic number, because the mean of its divisors is an integer number (130400694).

Almost surely, 2^2168668720 is an apocalyptic number.

2168668720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2168668720 is an abundant number, since it is smaller than the sum of its proper divisors (3047359040).

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

2168668720 is a wasteful number, since it uses less digits than its factorization.

2168668720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 934813 (or 934807 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 46.

The square root of 2168668720 is about 46568.9673495129. The cubic root of 2168668720 is about 1294.3877827488.

The spelling of 2168668720 in words is "two billion, one hundred sixty-eight million, six hundred sixty-eight thousand, seven hundred twenty".