27987733 has 2 divisors, whose sum is σ = 27987734. Its totient is φ = 27987732.

The previous prime is 27987731. The next prime is 27987749. The reversal of 27987733 is 33778972.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27899524 + 88209 = 5282^2 + 297^2 .

It is a cyclic number.

It is not a de Polignac number, because 27987733 - 2¹ = 27987731 is a prime.

Together with 27987731, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27987731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13993866 + 13993867.

It is an arithmetic number, because the mean of its divisors is an integer number (13993867).

Almost surely, 2^27987733 is an apocalyptic number.

It is an amenable number.

27987733 is a deficient number, since it is larger than the sum of its proper divisors (1).

27987733 is an equidigital number, since it uses as much as digits as its factorization.

27987733 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 444528, while the sum is 46.

The square root of 27987733 is about 5290.3433725988. The cubic root of 27987733 is about 303.6145456661.

The spelling of 27987733 in words is "twenty-seven million, nine hundred eighty-seven thousand, seven hundred thirty-three".