27999791 has 2 divisors, whose sum is σ = 27999792. Its totient is φ = 27999790.

The previous prime is 27999767. The next prime is 27999841. The reversal of 27999791 is 19799972.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 27999791 - 2¹⁰ = 27998767 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27999701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13999895 + 13999896.

It is an arithmetic number, because the mean of its divisors is an integer number (13999896).

Almost surely, 2^27999791 is an apocalyptic number.

27999791 is a deficient number, since it is larger than the sum of its proper divisors (1).

27999791 is an equidigital number, since it uses as much as digits as its factorization.

27999791 is an evil number, because the sum of its binary digits is even.

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

The square root of 27999791 is about 5291.4828734486. The cubic root of 27999791 is about 303.6581416534.

The spelling of 27999791 in words is "twenty-seven million, nine hundred ninety-nine thousand, seven hundred ninety-one".