27971288069 has 2 divisors, whose sum is σ = 27971288070. Its totient is φ = 27971288068.

The previous prime is 27971288039. The next prime is 27971288141. The reversal of 27971288069 is 96088217972.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14777319844 + 13193968225 = 121562^2 + 114865^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27971288069 is a prime.

It is a super-2 number, since 2×27971288069² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 27971287999 and 27971288017.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27971288029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13985644034 + 13985644035.

It is an arithmetic number, because the mean of its divisors is an integer number (13985644035).

Almost surely, 2^27971288069 is an apocalyptic number.

It is an amenable number.

27971288069 is a deficient number, since it is larger than the sum of its proper divisors (1).

27971288069 is an equidigital number, since it uses as much as digits as its factorization.

27971288069 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6096384, while the sum is 59.

The spelling of 27971288069 in words is "twenty-seven billion, nine hundred seventy-one million, two hundred eighty-eight thousand, sixty-nine".