2788641689 has 2 divisors, whose sum is σ = 2788641690. Its totient is φ = 2788641688.

The previous prime is 2788641679. The next prime is 2788641731. The reversal of 2788641689 is 9861468872.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2697763600 + 90878089 = 51940^2 + 9533^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2788641689 is a prime.

It is not a weakly prime, because it can be changed into another prime (2788641629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1394320844 + 1394320845.

It is an arithmetic number, because the mean of its divisors is an integer number (1394320845).

Almost surely, 2^2788641689 is an apocalyptic number.

It is an amenable number.

2788641689 is a deficient number, since it is larger than the sum of its proper divisors (1).

2788641689 is an equidigital number, since it uses as much as digits as its factorization.

2788641689 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9289728, while the sum is 59.

The square root of 2788641689 is about 52807.5912061893. The cubic root of 2788641689 is about 1407.5513204347.

The spelling of 2788641689 in words is "two billion, seven hundred eighty-eight million, six hundred forty-one thousand, six hundred eighty-nine".