27818969389 has 4 divisors (see below), whose sum is σ = 27823441660. Its totient is φ = 27814497120.

The previous prime is 27818969363. The next prime is 27818969413. The reversal of 27818969389 is 98396981872.

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 16597168900 + 11221800489 = 128830^2 + 105933^2 .

It is a cyclic number.

It is not a de Polignac number, because 27818969389 - 2²³ = 27810580781 is a prime.

It is a super-2 number, since 2×27818969389² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27818969309) 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, 2226792 + ... + 2239249.

It is an arithmetic number, because the mean of its divisors is an integer number (6955860415).

Almost surely, 2^27818969389 is an apocalyptic number.

It is an amenable number.

27818969389 is a deficient number, since it is larger than the sum of its proper divisors (4472271).

27818969389 is an equidigital number, since it uses as much as digits as its factorization.

27818969389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4472270.

The product of its digits is 94058496, while the sum is 70.

The spelling of 27818969389 in words is "twenty-seven billion, eight hundred eighteen million, nine hundred sixty-nine thousand, three hundred eighty-nine".