28421280689 has 2 divisors, whose sum is σ = 28421280690. Its totient is φ = 28421280688.

The previous prime is 28421280683. The next prime is 28421280703. The reversal of 28421280689 is 98608212482.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21616350625 + 6804930064 = 147025^2 + 82492^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28421280689 is a prime.

It is not a weakly prime, because it can be changed into another prime (28421280683) 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, 14210640344 + 14210640345.

It is an arithmetic number, because the mean of its divisors is an integer number (14210640345).

Almost surely, 2^28421280689 is an apocalyptic number.

It is an amenable number.

28421280689 is a deficient number, since it is larger than the sum of its proper divisors (1).

28421280689 is an equidigital number, since it uses as much as digits as its factorization.

28421280689 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 884736, while the sum is 50.

The spelling of 28421280689 in words is "twenty-eight billion, four hundred twenty-one million, two hundred eighty thousand, six hundred eighty-nine".