26805034687 has 4 divisors (see below), whose sum is σ = 26832641256. Its totient is φ = 26777428120.

The previous prime is 26805034667. The next prime is 26805034703. The reversal of 26805034687 is 78643050862.

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

It is a cyclic number.

It is not a de Polignac number, because 26805034687 - 2⁷ = 26805034559 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 26805034687.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26805034667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13801828 + ... + 13803769.

It is an arithmetic number, because the mean of its divisors is an integer number (6708160314).

Almost surely, 2^26805034687 is an apocalyptic number.

26805034687 is a deficient number, since it is larger than the sum of its proper divisors (27606569).

26805034687 is an equidigital number, since it uses as much as digits as its factorization.

26805034687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27606568.

The product of its (nonzero) digits is 1935360, while the sum is 49.

The spelling of 26805034687 in words is "twenty-six billion, eight hundred five million, thirty-four thousand, six hundred eighty-seven".