27990769081 has 4 divisors (see below), whose sum is σ = 30535384464. Its totient is φ = 25446153700.

The previous prime is 27990768997. The next prime is 27990769129. The reversal of 27990769081 is 18096709972.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 27990769081 - 2²¹ = 27988671929 is a prime.

It is a super-2 number, since 2×27990769081² (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 (27990769981) 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, 1272307675 + ... + 1272307696.

It is an arithmetic number, because the mean of its divisors is an integer number (7633846116).

Almost surely, 2^27990769081 is an apocalyptic number.

It is an amenable number.

27990769081 is a deficient number, since it is larger than the sum of its proper divisors (2544615383).

27990769081 is a wasteful number, since it uses less digits than its factorization.

27990769081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2544615382.

The product of its (nonzero) digits is 3429216, while the sum is 58.

The spelling of 27990769081 in words is "twenty-seven billion, nine hundred ninety million, seven hundred sixty-nine thousand, eighty-one".