27785705069 has 8 divisors (see below), whose sum is σ = 28751768760. Its totient is φ = 26820170496.

The previous prime is 27785705047. The next prime is 27785705071. The reversal of 27785705069 is 96050758772.

It can be written as a sum of positive squares in 4 ways, for example, as 175562500 + 27610142569 = 13250^2 + 166163^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 27785705069 - 2⁸ = 27785704813 is a prime.

It is a super-2 number, since 2×27785705069² (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 (27785705009) 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 7 ways as a sum of consecutive naturals, for example, 23912 + ... + 236945.

It is an arithmetic number, because the mean of its divisors is an integer number (3593971095).

Almost surely, 2^27785705069 is an apocalyptic number.

27785705069 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

27785705069 is a deficient number, since it is larger than the sum of its proper divisors (966063691).

27785705069 is a wasteful number, since it uses less digits than its factorization.

27785705069 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 264559.

The product of its (nonzero) digits is 7408800, while the sum is 56.

The spelling of 27785705069 in words is "twenty-seven billion, seven hundred eighty-five million, seven hundred five thousand, sixty-nine".