28389021679 has 2 divisors, whose sum is σ = 28389021680. Its totient is φ = 28389021678.

The previous prime is 28389021671. The next prime is 28389021697. The reversal of 28389021679 is 97612098382.

Together with next prime (28389021697) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28389021679 - 2³ = 28389021671 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28389021671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14194510839 + 14194510840.

It is an arithmetic number, because the mean of its divisors is an integer number (14194510840).

Almost surely, 2^28389021679 is an apocalyptic number.

28389021679 is a deficient number, since it is larger than the sum of its proper divisors (1).

28389021679 is an equidigital number, since it uses as much as digits as its factorization.

28389021679 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2612736, while the sum is 55.

The spelling of 28389021679 in words is "twenty-eight billion, three hundred eighty-nine million, twenty-one thousand, six hundred seventy-nine".