26690809 has 4 divisors (see below), whose sum is σ = 26763904. Its totient is φ = 26617716.

The previous prime is 26690791. The next prime is 26690813. The reversal of 26690809 is 90809662.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 90809662 = 2 ⋅45404831.

It is a cyclic number.

It is not a de Polignac number, because 26690809 - 2⁵ = 26690777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26690899) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35997 + ... + 36730.

It is an arithmetic number, because the mean of its divisors is an integer number (6690976).

Almost surely, 2^26690809 is an apocalyptic number.

It is an amenable number.

26690809 is a deficient number, since it is larger than the sum of its proper divisors (73095).

26690809 is an equidigital number, since it uses as much as digits as its factorization.

26690809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73094.

The product of its (nonzero) digits is 46656, while the sum is 40.

The square root of 26690809 is about 5166.3148374833. The cubic root of 26690809 is about 298.8504488818.

The spelling of 26690809 in words is "twenty-six million, six hundred ninety thousand, eight hundred nine".