28087206957889 has 2 divisors, whose sum is σ = 28087206957890. Its totient is φ = 28087206957888.

The previous prime is 28087206957871. The next prime is 28087206957919. The reversal of 28087206957889 is 98875960278082.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27464988897025 + 622218060864 = 5240705^2 + 788808^2 .

It is a cyclic number.

It is not a de Polignac number, because 28087206957889 - 2⁹ = 28087206957377 is a prime.

It is not a weakly prime, because it can be changed into another prime (28087206957829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14043603478944 + 14043603478945.

It is an arithmetic number, because the mean of its divisors is an integer number (14043603478945).

Almost surely, 2^{28087206957889} is an apocalyptic number.

It is an amenable number.

28087206957889 is a deficient number, since it is larger than the sum of its proper divisors (1).

28087206957889 is an equidigital number, since it uses as much as digits as its factorization.

28087206957889 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1950842880, while the sum is 79.

The spelling of 28087206957889 in words is "twenty-eight trillion, eighty-seven billion, two hundred six million, nine hundred fifty-seven thousand, eight hundred eighty-nine".