6788221 has 6 divisors (see below), whose sum is σ = 7461566. Its totient is φ = 6171000.

The previous prime is 6788207. The next prime is 6788237. The reversal of 6788221 is 1228876.

It can be written as a sum of positive squares in only one way, i.e., 6125625 + 662596 = 2475^2 + 814^2 .

It is a de Polignac number, because none of the positive numbers 2^k-6788221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6788251) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 27930 + ... + 28171.

Almost surely, 2^6788221 is an apocalyptic number.

It is an amenable number.

6788221 is a deficient number, since it is larger than the sum of its proper divisors (673345).

6788221 is a wasteful number, since it uses less digits than its factorization.

6788221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56123 (or 56112 counting only the distinct ones).

The product of its digits is 10752, while the sum is 34.

The square root of 6788221 is about 2605.4214630267. The cubic root of 6788221 is about 189.3441933063.

It can be divided in two parts, 67 and 88221, that added together give a palindrome (88288).

The spelling of 6788221 in words is "six million, seven hundred eighty-eight thousand, two hundred twenty-one".