27806779807 has 4 divisors (see below), whose sum is σ = 28703772736. Its totient is φ = 26909786880.

The previous prime is 27806779711. The next prime is 27806779817. The reversal of 27806779807 is 70897760872.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27806779807 is a prime.

It is a super-3 number, since 3×27806779807³ (a number of 32 digits) contains 333 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 (27806779817) 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, 448496418 + ... + 448496479.

It is an arithmetic number, because the mean of its divisors is an integer number (7175943184).

Almost surely, 2^27806779807 is an apocalyptic number.

27806779807 is a deficient number, since it is larger than the sum of its proper divisors (896992929).

27806779807 is an equidigital number, since it uses as much as digits as its factorization.

27806779807 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 896992928.

The product of its (nonzero) digits is 16595712, while the sum is 61.

The spelling of 27806779807 in words is "twenty-seven billion, eight hundred six million, seven hundred seventy-nine thousand, eight hundred seven".