27628978189 has 2 divisors, whose sum is σ = 27628978190. Its totient is φ = 27628978188.

The previous prime is 27628978171. The next prime is 27628978207. The reversal of 27628978189 is 98187982672.

It is a balanced prime because it is at equal distance from previous prime (27628978171) and next prime (27628978207).

It can be written as a sum of positive squares in only one way, i.e., 15754517289 + 11874460900 = 125517^2 + 108970^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27628978189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27628978789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13814489094 + 13814489095.

It is an arithmetic number, because the mean of its divisors is an integer number (13814489095).

Almost surely, 2^27628978189 is an apocalyptic number.

It is an amenable number.

27628978189 is a deficient number, since it is larger than the sum of its proper divisors (1).

27628978189 is an equidigital number, since it uses as much as digits as its factorization.

27628978189 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48771072, while the sum is 67.

The spelling of 27628978189 in words is "twenty-seven billion, six hundred twenty-eight million, nine hundred seventy-eight thousand, one hundred eighty-nine".