2168136780 has 24 divisors (see below), whose sum is σ = 6070783152. Its totient is φ = 578169792.

The previous prime is 2168136757. The next prime is 2168136781. The reversal of 2168136780 is 876318612.

It is a super-3 number, since 3×2168136780³ (a number of 29 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (2168136781) 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, 18067747 + ... + 18067866.

It is an arithmetic number, because the mean of its divisors is an integer number (252949298).

Almost surely, 2^2168136780 is an apocalyptic number.

2168136780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2168136780 is an abundant number, since it is smaller than the sum of its proper divisors (3902646372).

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

2168136780 is a wasteful number, since it uses less digits than its factorization.

2168136780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36135625 (or 36135623 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 42.

The square root of 2168136780 is about 46563.2556851430. The cubic root of 2168136780 is about 1294.2819431717.

The spelling of 2168136780 in words is "two billion, one hundred sixty-eight million, one hundred thirty-six thousand, seven hundred eighty".