26005613 has 4 divisors (see below), whose sum is σ = 26016480. Its totient is φ = 25994748.

The previous prime is 26005589. The next prime is 26005619. The reversal of 26005613 is 31650062.

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 a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 31650062 = 2 ⋅15825031.

It is a cyclic number.

It is not a de Polignac number, because 26005613 - 2⁶ = 26005549 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26005619) 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, 95 + ... + 7212.

It is an arithmetic number, because the mean of its divisors is an integer number (6504120).

Almost surely, 2^26005613 is an apocalyptic number.

It is an amenable number.

26005613 is a deficient number, since it is larger than the sum of its proper divisors (10867).

26005613 is an equidigital number, since it uses as much as digits as its factorization.

26005613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10866.

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 26005613 is about 5099.5698838235. The cubic root of 26005613 is about 296.2709238843.

Adding to 26005613 its reverse (31650062), we get a palindrome (57655675).

The spelling of 26005613 in words is "twenty-six million, five thousand, six hundred thirteen".