26668645 has 4 divisors (see below), whose sum is σ = 32002380. Its totient is φ = 21334912.

The previous prime is 26668639. The next prime is 26668669. The reversal of 26668645 is 54686662.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 13118884 + 13549761 = 3622^2 + 3681^2 .

It is a cyclic number.

It is not a de Polignac number, because 26668645 - 2³ = 26668637 is a prime.

It is a super-2 number, since 2×26668645² = 1422433252272050, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2666860 + ... + 2666869.

It is an arithmetic number, because the mean of its divisors is an integer number (8000595).

Almost surely, 2^26668645 is an apocalyptic number.

It is an amenable number.

26668645 is a deficient number, since it is larger than the sum of its proper divisors (5333735).

26668645 is an equidigital number, since it uses as much as digits as its factorization.

26668645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5333734.

The product of its digits is 414720, while the sum is 43.

The square root of 26668645 is about 5164.1693426920. The cubic root of 26668645 is about 298.7677043481.

It can be divided in two parts, 2666 and 8645, that added together give a palindrome (11311).

The spelling of 26668645 in words is "twenty-six million, six hundred sixty-eight thousand, six hundred forty-five".