27915689 has 2 divisors, whose sum is σ = 27915690. Its totient is φ = 27915688.

The previous prime is 27915653. The next prime is 27915691. The reversal of 27915689 is 98651972.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21114025 + 6801664 = 4595^2 + 2608^2 .

It is a cyclic number.

It is not a de Polignac number, because 27915689 - 2¹² = 27911593 is a prime.

Together with 27915691, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (27935689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13957844 + 13957845.

It is an arithmetic number, because the mean of its divisors is an integer number (13957845).

Almost surely, 2^27915689 is an apocalyptic number.

It is an amenable number.

27915689 is a deficient number, since it is larger than the sum of its proper divisors (1).

27915689 is an equidigital number, since it uses as much as digits as its factorization.

27915689 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 272160, while the sum is 47.

The square root of 27915689 is about 5283.5299753101. The cubic root of 27915689 is about 303.3538076051.

The spelling of 27915689 in words is "twenty-seven million, nine hundred fifteen thousand, six hundred eighty-nine".