27990169 has 2 divisors, whose sum is σ = 27990170. Its totient is φ = 27990168.

The previous prime is 27990163. The next prime is 27990187. The reversal of 27990169 is 96109972.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27962944 + 27225 = 5288^2 + 165^2 .

It is a cyclic number.

It is not a de Polignac number, because 27990169 - 2³ = 27990161 is a prime.

It is a super-2 number, since 2×27990169² = 1566899121297122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (27990161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13995084 + 13995085.

It is an arithmetic number, because the mean of its divisors is an integer number (13995085).

Almost surely, 2^27990169 is an apocalyptic number.

It is an amenable number.

27990169 is a deficient number, since it is larger than the sum of its proper divisors (1).

27990169 is an equidigital number, since it uses as much as digits as its factorization.

27990169 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 61236, while the sum is 43.

The square root of 27990169 is about 5290.5735983918. The cubic root of 27990169 is about 303.6233540915.

The spelling of 27990169 in words is "twenty-seven million, nine hundred ninety thousand, one hundred sixty-nine".