28788102689 has 4 divisors (see below), whose sum is σ = 28831655700. Its totient is φ = 28744549680.

The previous prime is 28788102667. The next prime is 28788102703. The reversal of 28788102689 is 98620188782.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 98620188782 = 2 ⋅49310094391.

It can be written as a sum of positive squares in 2 ways, for example, as 16068097600 + 12720005089 = 126760^2 + 112783^2 .

It is a cyclic number.

It is not a de Polignac number, because 28788102689 - 2⁸ = 28788102433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28788102289) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21775514 + ... + 21776835.

It is an arithmetic number, because the mean of its divisors is an integer number (7207913925).

Almost surely, 2^28788102689 is an apocalyptic number.

It is an amenable number.

28788102689 is a deficient number, since it is larger than the sum of its proper divisors (43553011).

28788102689 is an equidigital number, since it uses as much as digits as its factorization.

28788102689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43553010.

The product of its (nonzero) digits is 6193152, while the sum is 59.

The spelling of 28788102689 in words is "twenty-eight billion, seven hundred eighty-eight million, one hundred two thousand, six hundred eighty-nine".