27840863 has 2 divisors, whose sum is σ = 27840864. Its totient is φ = 27840862.

The previous prime is 27840811. The next prime is 27840887. The reversal of 27840863 is 36804872.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 27840863 - 2²⁰ = 26792287 is a prime.

It is a super-2 number, since 2×27840863² = 1550227305169538, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27840803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13920431 + 13920432.

It is an arithmetic number, because the mean of its divisors is an integer number (13920432).

Almost surely, 2^27840863 is an apocalyptic number.

27840863 is a deficient number, since it is larger than the sum of its proper divisors (1).

27840863 is an equidigital number, since it uses as much as digits as its factorization.

27840863 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64512, while the sum is 38.

The square root of 27840863 is about 5276.4441625019. Note that the first 3 decimals coincide. The cubic root of 27840863 is about 303.0825257099.

The spelling of 27840863 in words is "twenty-seven million, eight hundred forty thousand, eight hundred sixty-three".