27987311 has 4 divisors (see below), whose sum is σ = 30531624. Its totient is φ = 25443000.

The previous prime is 27987301. The next prime is 27987317. The reversal of 27987311 is 11378972.

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

It is a de Polignac number, because none of the positive numbers 2^k-27987311 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27987317) 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, 1272140 + ... + 1272161.

It is an arithmetic number, because the mean of its divisors is an integer number (7632906).

Almost surely, 2^27987311 is an apocalyptic number.

27987311 is a deficient number, since it is larger than the sum of its proper divisors (2544313).

27987311 is a wasteful number, since it uses less digits than its factorization.

27987311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2544312.

The product of its digits is 21168, while the sum is 38.

The square root of 27987311 is about 5290.3034884589. The cubic root of 27987311 is about 303.6130196882.

The spelling of 27987311 in words is "twenty-seven million, nine hundred eighty-seven thousand, three hundred eleven".