27978827 has 2 divisors, whose sum is σ = 27978828. Its totient is φ = 27978826.

The previous prime is 27978793. The next prime is 27978829. The reversal of 27978827 is 72887972.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 27978827 - 2⁶ = 27978763 is a prime.

Together with 27978829, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (27978829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13989413 + 13989414.

It is an arithmetic number, because the mean of its divisors is an integer number (13989414).

Almost surely, 2^27978827 is an apocalyptic number.

27978827 is a deficient number, since it is larger than the sum of its proper divisors (1).

27978827 is an equidigital number, since it uses as much as digits as its factorization.

27978827 is an evil number, because the sum of its binary digits is even.

The product of its digits is 790272, while the sum is 50.

The square root of 27978827 is about 5289.5015833252. The cubic root of 27978827 is about 303.5823377698.

The spelling of 27978827 in words is "twenty-seven million, nine hundred seventy-eight thousand, eight hundred twenty-seven".