6688369 has 4 divisors (see below), whose sum is σ = 6695140. Its totient is φ = 6681600.

The previous prime is 6688351. The next prime is 6688387. The reversal of 6688369 is 9638866.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 9638866 = 2 ⋅4819433.

It is an interprime number because it is at equal distance from previous prime (6688351) and next prime (6688387).

It can be written as a sum of positive squares in 2 ways, for example, as 378225 + 6310144 = 615^2 + 2512^2 .

It is a cyclic number.

It is not a de Polignac number, because 6688369 - 2⁵ = 6688337 is a prime.

It is a super-2 number, since 2×6688369² = 89468559760322, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6688309) by changing a digit.

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, 1584 + ... + 3985.

It is an arithmetic number, because the mean of its divisors is an integer number (1673785).

Almost surely, 2^6688369 is an apocalyptic number.

It is an amenable number.

6688369 is a deficient number, since it is larger than the sum of its proper divisors (6771).

6688369 is a wasteful number, since it uses less digits than its factorization.

6688369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6770.

The product of its digits is 373248, while the sum is 46.

The square root of 6688369 is about 2586.1881215410. The cubic root of 6688369 is about 188.4112113420.

The spelling of 6688369 in words is "six million, six hundred eighty-eight thousand, three hundred sixty-nine".