27728745013 has 2 divisors, whose sum is σ = 27728745014. Its totient is φ = 27728745012.

The previous prime is 27728745001. The next prime is 27728745029. The reversal of 27728745013 is 31054782772.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22690300689 + 5038444324 = 150633^2 + 70982^2 .

It is a cyclic number.

It is not a de Polignac number, because 27728745013 - 2³³ = 19138810421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27728745043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13864372506 + 13864372507.

It is an arithmetic number, because the mean of its divisors is an integer number (13864372507).

Almost surely, 2^27728745013 is an apocalyptic number.

It is an amenable number.

27728745013 is a deficient number, since it is larger than the sum of its proper divisors (1).

27728745013 is an equidigital number, since it uses as much as digits as its factorization.

27728745013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 658560, while the sum is 46.

The spelling of 27728745013 in words is "twenty-seven billion, seven hundred twenty-eight million, seven hundred forty-five thousand, thirteen".