27728573009 has 2 divisors, whose sum is σ = 27728573010. Its totient is φ = 27728573008.

The previous prime is 27728573003. The next prime is 27728573017. The reversal of 27728573009 is 90037582772.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23861598784 + 3866974225 = 154472^2 + 62185^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27728573009 is a prime.

It is a super-2 number, since 2×27728573009² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (27728573003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13864286504 + 13864286505.

It is an arithmetic number, because the mean of its divisors is an integer number (13864286505).

Almost surely, 2^27728573009 is an apocalyptic number.

It is an amenable number.

27728573009 is a deficient number, since it is larger than the sum of its proper divisors (1).

27728573009 is an equidigital number, since it uses as much as digits as its factorization.

27728573009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1481760, while the sum is 50.

The spelling of 27728573009 in words is "twenty-seven billion, seven hundred twenty-eight million, five hundred seventy-three thousand, nine".