26890209 has 12 divisors (see below), whose sum is σ = 41126436. Its totient is φ = 16872192.

The previous prime is 26890183. The next prime is 26890211. The reversal of 26890209 is 90209862.

It can be written as a sum of positive squares in 2 ways, for example, as 22467600 + 4422609 = 4740^2 + 2103^2 .

It is not a de Polignac number, because 26890209 - 2⁸ = 26889953 is a prime.

It is not an unprimeable number, because it can be changed into a prime (26890229) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 87724 + ... + 88029.

It is an arithmetic number, because the mean of its divisors is an integer number (3427203).

Almost surely, 2^26890209 is an apocalyptic number.

It is an amenable number.

26890209 is a deficient number, since it is larger than the sum of its proper divisors (14236227).

26890209 is a wasteful number, since it uses less digits than its factorization.

26890209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 175776 (or 175773 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 26890209 is about 5185.5770170734. The cubic root of 26890209 is about 299.5928142493.

The spelling of 26890209 in words is "twenty-six million, eight hundred ninety thousand, two hundred nine".