27918889 has 2 divisors, whose sum is σ = 27918890. Its totient is φ = 27918888.

The previous prime is 27918883. The next prime is 27918899. The reversal of 27918889 is 98881972.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16810000 + 11108889 = 4100^2 + 3333^2 .

It is a cyclic number.

It is not a de Polignac number, because 27918889 - 2³ = 27918881 is a prime.

It is not a weakly prime, because it can be changed into another prime (27918881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13959444 + 13959445.

It is an arithmetic number, because the mean of its divisors is an integer number (13959445).

Almost surely, 2^27918889 is an apocalyptic number.

It is an amenable number.

27918889 is a deficient number, since it is larger than the sum of its proper divisors (1).

27918889 is an equidigital number, since it uses as much as digits as its factorization.

27918889 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 580608, while the sum is 52.

The square root of 27918889 is about 5283.8327944779. The cubic root of 27918889 is about 303.3653984002.

The spelling of 27918889 in words is "twenty-seven million, nine hundred eighteen thousand, eight hundred eighty-nine".