26788221 has 12 divisors (see below), whose sum is σ = 38806560. Its totient is φ = 17806920.

The previous prime is 26788217. The next prime is 26788253. The reversal of 26788221 is 12288762.

It is a happy number.

It is not a de Polignac number, because 26788221 - 2² = 26788217 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26788291) 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 11 ways as a sum of consecutive naturals, for example, 915 + ... + 7376.

It is an arithmetic number, because the mean of its divisors is an integer number (3233880).

Almost surely, 2^26788221 is an apocalyptic number.

It is an amenable number.

26788221 is a deficient number, since it is larger than the sum of its proper divisors (12018339).

26788221 is a wasteful number, since it uses less digits than its factorization.

26788221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8656 (or 8653 counting only the distinct ones).

The product of its digits is 21504, while the sum is 36.

The square root of 26788221 is about 5175.7338610095. The cubic root of 26788221 is about 299.2135735797.

It can be divided in two parts, 267 and 88221, that added together give a palindrome (88488).

The spelling of 26788221 in words is "twenty-six million, seven hundred eighty-eight thousand, two hundred twenty-one".