2168386720 has 48 divisors (see below), whose sum is σ = 5424162408. Its totient is φ = 816332800.

The previous prime is 2168386559. The next prime is 2168386733. The reversal of 2168386720 is 276838612.

It can be written as a sum of positive squares in 4 ways, for example, as 2149620496 + 18766224 = 46364^2 + 4332^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 395881 + ... + 401320.

Almost surely, 2^2168386720 is an apocalyptic number.

2168386720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2168386720 is an abundant number, since it is smaller than the sum of its proper divisors (3255775688).

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

2168386720 is a wasteful number, since it uses less digits than its factorization.

2168386720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 797233 (or 797225 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 43.

The square root of 2168386720 is about 46565.9394837042. The cubic root of 2168386720 is about 1294.3316756427.

The spelling of 2168386720 in words is "two billion, one hundred sixty-eight million, three hundred eighty-six thousand, seven hundred twenty".