27988913 has 2 divisors, whose sum is σ = 27988914. Its totient is φ = 27988912.

The previous prime is 27988903. The next prime is 27988921. The reversal of 27988913 is 31988972.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19963024 + 8025889 = 4468^2 + 2833^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27988913 is a prime.

It is not a weakly prime, because it can be changed into another prime (27988903) 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, 13994456 + 13994457.

It is an arithmetic number, because the mean of its divisors is an integer number (13994457).

Almost surely, 2^27988913 is an apocalyptic number.

It is an amenable number.

27988913 is a deficient number, since it is larger than the sum of its proper divisors (1).

27988913 is an equidigital number, since it uses as much as digits as its factorization.

27988913 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 217728, while the sum is 47.

The square root of 27988913 is about 5290.4548953753. The cubic root of 27988913 is about 303.6188125370.

It can be divided in two parts, 2798 and 8913, that added together give a palindrome (11711).

The spelling of 27988913 in words is "twenty-seven million, nine hundred eighty-eight thousand, nine hundred thirteen".