27868128361 has 4 divisors (see below), whose sum is σ = 27870768772. Its totient is φ = 27865487952.

The previous prime is 27868128313. The next prime is 27868128367. The reversal of 27868128361 is 16382186872.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9927133225 + 17940995136 = 99635^2 + 133944^2 .

It is a cyclic number.

It is not a de Polignac number, because 27868128361 - 2³³ = 19278193769 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 27868128299 and 27868128308.

It is not an unprimeable number, because it can be changed into a prime (27868128367) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1304310 + ... + 1325503.

It is an arithmetic number, because the mean of its divisors is an integer number (6967692193).

Almost surely, 2^27868128361 is an apocalyptic number.

It is an amenable number.

27868128361 is a deficient number, since it is larger than the sum of its proper divisors (2640411).

27868128361 is a wasteful number, since it uses less digits than its factorization.

27868128361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2640410.

The product of its digits is 1548288, while the sum is 52.

The spelling of 27868128361 in words is "twenty-seven billion, eight hundred sixty-eight million, one hundred twenty-eight thousand, three hundred sixty-one".