27988879 has 2 divisors, whose sum is σ = 27988880. Its totient is φ = 27988878.

The previous prime is 27988871. The next prime is 27988889. The reversal of 27988879 is 97888972.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 27988879 - 2³ = 27988871 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27988871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13994439 + 13994440.

It is an arithmetic number, because the mean of its divisors is an integer number (13994440).

Almost surely, 2^27988879 is an apocalyptic number.

27988879 is a deficient number, since it is larger than the sum of its proper divisors (1).

27988879 is an equidigital number, since it uses as much as digits as its factorization.

27988879 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4064256, while the sum is 58.

The square root of 27988879 is about 5290.4516820400. The cubic root of 27988879 is about 303.6186895949.

The spelling of 27988879 in words is "twenty-seven million, nine hundred eighty-eight thousand, eight hundred seventy-nine".