26788639 has 4 divisors (see below), whose sum is σ = 26799760. Its totient is φ = 26777520.

The previous prime is 26788633. The next prime is 26788661. The reversal of 26788639 is 93688762.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 26788639 - 2⁷ = 26788511 is a prime.

It is a Duffinian number.

It is a zygodrome in base 2.

It is a junction number, because it is equal to n+sod(n) for n = 26788592 and 26788601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26788633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 267 + ... + 7324.

It is an arithmetic number, because the mean of its divisors is an integer number (6699940).

Almost surely, 2^26788639 is an apocalyptic number.

26788639 is a deficient number, since it is larger than the sum of its proper divisors (11121).

26788639 is an equidigital number, since it uses as much as digits as its factorization.

26788639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11120.

The product of its digits is 870912, while the sum is 49.

The square root of 26788639 is about 5175.7742415990. The cubic root of 26788639 is about 299.2151298685.

The spelling of 26788639 in words is "twenty-six million, seven hundred eighty-eight thousand, six hundred thirty-nine".