27728588869 has 2 divisors, whose sum is σ = 27728588870. Its totient is φ = 27728588868.

The previous prime is 27728588857. The next prime is 27728588887. The reversal of 27728588869 is 96888582772.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17590716900 + 10137871969 = 132630^2 + 100687^2 .

It is a cyclic number.

It is not a de Polignac number, because 27728588869 - 2³³ = 19138654277 is a prime.

It is a super-2 number, since 2×27728588869² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 27728588798 and 27728588807.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27728586869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13864294434 + 13864294435.

It is an arithmetic number, because the mean of its divisors is an integer number (13864294435).

Almost surely, 2^27728588869 is an apocalyptic number.

It is an amenable number.

27728588869 is a deficient number, since it is larger than the sum of its proper divisors (1).

27728588869 is an equidigital number, since it uses as much as digits as its factorization.

27728588869 is an evil number, because the sum of its binary digits is even.

The product of its digits is 216760320, while the sum is 70.

The spelling of 27728588869 in words is "twenty-seven billion, seven hundred twenty-eight million, five hundred eighty-eight thousand, eight hundred sixty-nine".