27728746589 has 2 divisors, whose sum is σ = 27728746590. Its totient is φ = 27728746588.

The previous prime is 27728746583. The next prime is 27728746657. The reversal of 27728746589 is 98564782772.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24411562564 + 3317184025 = 156242^2 + 57595^2 .

It is a cyclic number.

It is not a de Polignac number, because 27728746589 - 2¹⁶ = 27728681053 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27728746583) 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, 13864373294 + 13864373295.

It is an arithmetic number, because the mean of its divisors is an integer number (13864373295).

Almost surely, 2^27728746589 is an apocalyptic number.

It is an amenable number.

27728746589 is a deficient number, since it is larger than the sum of its proper divisors (1).

27728746589 is an equidigital number, since it uses as much as digits as its factorization.

27728746589 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 94832640, while the sum is 65.

The spelling of 27728746589 in words is "twenty-seven billion, seven hundred twenty-eight million, seven hundred forty-six thousand, five hundred eighty-nine".