27800747647 has 2 divisors, whose sum is σ = 27800747648. Its totient is φ = 27800747646.

The previous prime is 27800747633. The next prime is 27800747699. The reversal of 27800747647 is 74674700872.

It is an a-pointer prime, because the next prime (27800747699) can be obtained adding 27800747647 to its sum of digits (52).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 27800747647 - 2¹⁹ = 27800223359 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 27800747594 and 27800747603.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27800717647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13900373823 + 13900373824.

It is an arithmetic number, because the mean of its divisors is an integer number (13900373824).

Almost surely, 2^27800747647 is an apocalyptic number.

27800747647 is a deficient number, since it is larger than the sum of its proper divisors (1).

27800747647 is an equidigital number, since it uses as much as digits as its factorization.

27800747647 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3687936, while the sum is 52.

The spelling of 27800747647 in words is "twenty-seven billion, eight hundred million, seven hundred forty-seven thousand, six hundred forty-seven".