27996779 has 2 divisors, whose sum is σ = 27996780. Its totient is φ = 27996778.

The previous prime is 27996737. The next prime is 27996781. The reversal of 27996779 is 97769972.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 27996779 - 2⁸ = 27996523 is a prime.

It is a Sophie Germain prime.

Together with 27996781, 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 (27996799) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13998389 + 13998390.

It is an arithmetic number, because the mean of its divisors is an integer number (13998390).

Almost surely, 2^27996779 is an apocalyptic number.

27996779 is a deficient number, since it is larger than the sum of its proper divisors (1).

27996779 is an equidigital number, since it uses as much as digits as its factorization.

27996779 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3000564, while the sum is 56.

The square root of 27996779 is about 5291.1982574838. The cubic root of 27996779 is about 303.6472528683.

The spelling of 27996779 in words is "twenty-seven million, nine hundred ninety-six thousand, seven hundred seventy-nine".