2081688680 has 16 divisors (see below), whose sum is σ = 4683799620. Its totient is φ = 832675456.

The previous prime is 2081688677. The next prime is 2081688691. The reversal of 2081688680 is 868861802.

It can be written as a sum of positive squares in 2 ways, for example, as 1717107844 + 364580836 = 41438^2 + 19094^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26021069 + ... + 26021148.

Almost surely, 2^2081688680 is an apocalyptic number.

2081688680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2081688680 is an abundant number, since it is smaller than the sum of its proper divisors (2602110940).

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

2081688680 is a wasteful number, since it uses less digits than its factorization.

2081688680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52042228 (or 52042224 counting only the distinct ones).

The product of its (nonzero) digits is 294912, while the sum is 47.

The square root of 2081688680 is about 45625.5266270977. The cubic root of 2081688680 is about 1276.8462152819.

The spelling of 2081688680 in words is "two billion, eighty-one million, six hundred eighty-eight thousand, six hundred eighty".