27998591 has 2 divisors, whose sum is σ = 27998592. Its totient is φ = 27998590.

The previous prime is 27998587. The next prime is 27998617. The reversal of 27998591 is 19589972.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 27998591 - 2² = 27998587 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27997591) 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, 13999295 + 13999296.

It is an arithmetic number, because the mean of its divisors is an integer number (13999296).

Almost surely, 2^27998591 is an apocalyptic number.

27998591 is a deficient number, since it is larger than the sum of its proper divisors (1).

27998591 is an equidigital number, since it uses as much as digits as its factorization.

27998591 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 408240, while the sum is 50.

The square root of 27998591 is about 5291.3694824686. The cubic root of 27998591 is about 303.6538035856.

The spelling of 27998591 in words is "twenty-seven million, nine hundred ninety-eight thousand, five hundred ninety-one".