27728745287 has 2 divisors, whose sum is σ = 27728745288. Its totient is φ = 27728745286.

The previous prime is 27728745281. The next prime is 27728745311. The reversal of 27728745287 is 78254782772.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27728745287 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27728745281) 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, 13864372643 + 13864372644.

It is an arithmetic number, because the mean of its divisors is an integer number (13864372644).

Almost surely, 2^27728745287 is an apocalyptic number.

27728745287 is a deficient number, since it is larger than the sum of its proper divisors (1).

27728745287 is an equidigital number, since it uses as much as digits as its factorization.

27728745287 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24586240, while the sum is 59.

The spelling of 27728745287 in words is "twenty-seven billion, seven hundred twenty-eight million, seven hundred forty-five thousand, two hundred eighty-seven".