27807732681 has 8 divisors (see below), whose sum is σ = 37304443680. Its totient is φ = 18424755072.

The previous prime is 27807732671. The next prime is 27807732721. The reversal of 27807732681 is 18623770872.

It is a happy number.

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

It is not a de Polignac number, because 27807732681 - 2⁷ = 27807732553 is a prime.

It is a super-2 number, since 2×27807732681² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (27807732611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28432776 + ... + 28433753.

It is an arithmetic number, because the mean of its divisors is an integer number (4663055460).

Almost surely, 2^27807732681 is an apocalyptic number.

It is an amenable number.

27807732681 is a deficient number, since it is larger than the sum of its proper divisors (9496710999).

27807732681 is a wasteful number, since it uses less digits than its factorization.

27807732681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56866695.

The product of its (nonzero) digits is 1580544, while the sum is 51.

The spelling of 27807732681 in words is "twenty-seven billion, eight hundred seven million, seven hundred thirty-two thousand, six hundred eighty-one".