26880209 has 2 divisors, whose sum is σ = 26880210. Its totient is φ = 26880208.

The previous prime is 26880173. The next prime is 26880211. The reversal of 26880209 is 90208862.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20729809 + 6150400 = 4553^2 + 2480^2 .

It is a cyclic number.

It is not a de Polignac number, because 26880209 - 2²⁰ = 25831633 is a prime.

Together with 26880211, 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 (26880229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13440104 + 13440105.

It is an arithmetic number, because the mean of its divisors is an integer number (13440105).

Almost surely, 2^26880209 is an apocalyptic number.

It is an amenable number.

26880209 is a deficient number, since it is larger than the sum of its proper divisors (1).

26880209 is an equidigital number, since it uses as much as digits as its factorization.

26880209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13824, while the sum is 35.

The square root of 26880209 is about 5184.6127145622. The cubic root of 26880209 is about 299.5556718629. Note that the first 3 decimals are identical.

The spelling of 26880209 in words is "twenty-six million, eight hundred eighty thousand, two hundred nine".