27719819 has 2 divisors, whose sum is σ = 27719820. Its totient is φ = 27719818.

The previous prime is 27719789. The next prime is 27719831. The reversal of 27719819 is 91891772.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27719819 is a prime.

It is a super-2 number, since 2×27719819² = 1536776730785522, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 27719819.

It is not a weakly prime, because it can be changed into another prime (27719849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13859909 + 13859910.

It is an arithmetic number, because the mean of its divisors is an integer number (13859910).

Almost surely, 2^27719819 is an apocalyptic number.

27719819 is a deficient number, since it is larger than the sum of its proper divisors (1).

27719819 is an equidigital number, since it uses as much as digits as its factorization.

27719819 is an evil number, because the sum of its binary digits is even.

The product of its digits is 63504, while the sum is 44.

The square root of 27719819 is about 5264.9614433536. The cubic root of 27719819 is about 302.6426492928.

The spelling of 27719819 in words is "twenty-seven million, seven hundred nineteen thousand, eight hundred nineteen".