27405889369 has 4 divisors (see below), whose sum is σ = 27450597796. Its totient is φ = 27361180944.

The previous prime is 27405889367. The next prime is 27405889373. The reversal of 27405889369 is 96398850472.

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 1189422144 + 26216467225 = 34488^2 + 161915^2 .

It is a cyclic number.

It is not a de Polignac number, because 27405889369 - 2¹ = 27405889367 is a prime.

It is a super-2 number, since 2×27405889369² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27405889367) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22353294 + ... + 22354519.

It is an arithmetic number, because the mean of its divisors is an integer number (6862649449).

Almost surely, 2^27405889369 is an apocalyptic number.

It is an amenable number.

27405889369 is a deficient number, since it is larger than the sum of its proper divisors (44708427).

27405889369 is an equidigital number, since it uses as much as digits as its factorization.

27405889369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44708426.

The product of its (nonzero) digits is 26127360, while the sum is 61.

The spelling of 27405889369 in words is "twenty-seven billion, four hundred five million, eight hundred eighty-nine thousand, three hundred sixty-nine".