27286986781 has 12 divisors (see below), whose sum is σ = 28824148092. Its totient is φ = 25828015104.

The previous prime is 27286986763. The next prime is 27286986799. The reversal of 27286986781 is 18768968272.

It is an interprime number because it is at equal distance from previous prime (27286986763) and next prime (27286986799).

It can be written as a sum of positive squares in 2 ways, for example, as 20577902500 + 6709084281 = 143450^2 + 81909^2 .

It is not a de Polignac number, because 27286986781 - 2¹⁷ = 27286855709 is a prime.

It is a super-3 number, since 3×27286986781³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27286986481) 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 11 ways as a sum of consecutive naturals, for example, 383455 + ... + 449011.

It is an arithmetic number, because the mean of its divisors is an integer number (2402012341).

Almost surely, 2^27286986781 is an apocalyptic number.

It is an amenable number.

27286986781 is a deficient number, since it is larger than the sum of its proper divisors (1537161311).

27286986781 is a wasteful number, since it uses less digits than its factorization.

27286986781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66748 (or 66729 counting only the distinct ones).

The product of its digits is 32514048, while the sum is 64.

The spelling of 27286986781 in words is "twenty-seven billion, two hundred eighty-six million, nine hundred eighty-six thousand, seven hundred eighty-one".