26645 has 6 divisors (see below), whose sum is σ = 32418. Its totient is φ = 21024.

The previous prime is 26641. The next prime is 26647. The reversal of 26645 is 54662.

It can be written as a sum of positive squares in 3 ways, for example, as 3844 + 22801 = 62^2 + 151^2 .

It is not a de Polignac number, because 26645 - 2² = 26641 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 26645.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26641) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 329 + ... + 401.

It is an arithmetic number, because the mean of its divisors is an integer number (5403).

2²⁶⁶⁴⁵ is an apocalyptic number.

It is an amenable number.

26645 is a deficient number, since it is larger than the sum of its proper divisors (5773).

26645 is an frugal number, since it uses more digits than its factorization.

26645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151 (or 78 counting only the distinct ones).

The product of its digits is 1440, while the sum is 23.

The square root of 26645 is about 163.2329623575. The cubic root of 26645 is about 29.8679380261.

The spelling of 26645 in words is "twenty-six thousand, six hundred forty-five".