26640805 has 4 divisors (see below), whose sum is σ = 31968972. Its totient is φ = 21312640.

The previous prime is 26640791. The next prime is 26640827. The reversal of 26640805 is 50804662.

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 3437316 + 23203489 = 1854^2 + 4817^2 .

It is not a de Polignac number, because 26640805 - 2¹⁷ = 26509733 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2664076 + ... + 2664085.

It is an arithmetic number, because the mean of its divisors is an integer number (7992243).

Almost surely, 2^26640805 is an apocalyptic number.

It is an amenable number.

26640805 is a deficient number, since it is larger than the sum of its proper divisors (5328167).

26640805 is an equidigital number, since it uses as much as digits as its factorization.

26640805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5328166.

The product of its (nonzero) digits is 11520, while the sum is 31.

The square root of 26640805 is about 5161.4731424275. The cubic root of 26640805 is about 298.6637047022.

The spelling of 26640805 in words is "twenty-six million, six hundred forty thousand, eight hundred five".