27998287 has 2 divisors, whose sum is σ = 27998288. Its totient is φ = 27998286.

The previous prime is 27998263. The next prime is 27998359. The reversal of 27998287 is 78289972.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 27998287 - 2¹⁵ = 27965519 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27998587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13999143 + 13999144.

It is an arithmetic number, because the mean of its divisors is an integer number (13999144).

Almost surely, 2^27998287 is an apocalyptic number.

27998287 is a deficient number, since it is larger than the sum of its proper divisors (1).

27998287 is an equidigital number, since it uses as much as digits as its factorization.

27998287 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1016064, while the sum is 52.

The square root of 27998287 is about 5291.3407563679. The cubic root of 27998287 is about 303.6527045888.

The spelling of 27998287 in words is "twenty-seven million, nine hundred ninety-eight thousand, two hundred eighty-seven".