27719999 has 2 divisors, whose sum is σ = 27720000. Its totient is φ = 27719998.

The previous prime is 27719987. The next prime is 27720001. The reversal of 27719999 is 99991772.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 27719999 - 2⁸ = 27719743 is a prime.

Together with 27720001, it forms a pair of twin primes.

It is a Chen prime.

27719999 is a modest number, since divided by 9999 gives 2771 as remainder.

It is a self number, because there is not a number n which added to its sum of digits gives 27719999.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27719929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13859999 + 13860000.

It is an arithmetic number, because the mean of its divisors is an integer number (13860000).

Almost surely, 2^27719999 is an apocalyptic number.

27719999 is a deficient number, since it is larger than the sum of its proper divisors (1).

27719999 is an equidigital number, since it uses as much as digits as its factorization.

27719999 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 642978, while the sum is 53.

The square root of 27719999 is about 5264.9785374681. The cubic root of 27719999 is about 302.6433043663.

The spelling of 27719999 in words is "twenty-seven million, seven hundred nineteen thousand, nine hundred ninety-nine".