27008991 has 8 divisors (see below), whose sum is σ = 40013360. Its totient is φ = 18005976.

The previous prime is 27008987. The next prime is 27009007. The reversal of 27008991 is 19980072.

It is a happy number.

It is not a de Polignac number, because 27008991 - 2² = 27008987 is a prime.

It is a Duffinian number.

27008991 is a modest number, since divided by 8991 gives 27 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27008911) 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, 500140 + ... + 500193.

It is an arithmetic number, because the mean of its divisors is an integer number (5001670).

Almost surely, 2^27008991 is an apocalyptic number.

27008991 is a deficient number, since it is larger than the sum of its proper divisors (13004369).

27008991 is a wasteful number, since it uses less digits than its factorization.

27008991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1000342 (or 1000336 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 36.

The square root of 27008991 is about 5197.0175100725. The cubic root of 27008991 is about 300.0332963044.

The spelling of 27008991 in words is "twenty-seven million, eight thousand, nine hundred ninety-one".