27718969 has 2 divisors, whose sum is σ = 27718970. Its totient is φ = 27718968.

The previous prime is 27718939. The next prime is 27718987. The reversal of 27718969 is 96981772.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25200400 + 2518569 = 5020^2 + 1587^2 .

It is a cyclic number.

It is not a de Polignac number, because 27718969 - 2²³ = 19330361 is a prime.

It is a super-2 number, since 2×27718969² = 1536682484845922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (27718939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13859484 + 13859485.

It is an arithmetic number, because the mean of its divisors is an integer number (13859485).

Almost surely, 2^27718969 is an apocalyptic number.

It is an amenable number.

27718969 is a deficient number, since it is larger than the sum of its proper divisors (1).

27718969 is an equidigital number, since it uses as much as digits as its factorization.

27718969 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 381024, while the sum is 49.

The square root of 27718969 is about 5264.8807203962. The cubic root of 27718969 is about 302.6395558517.

The spelling of 27718969 in words is "twenty-seven million, seven hundred eighteen thousand, nine hundred sixty-nine".