6688355 has 4 divisors (see below), whose sum is σ = 8026032. Its totient is φ = 5350680.

The previous prime is 6688351. The next prime is 6688387. The reversal of 6688355 is 5538866.

6688355 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5538866 = 2 ⋅2769433.

It is not a de Polignac number, because 6688355 - 2² = 6688351 is a prime.

It is a Duffinian number.

It is a zygodrome in base 2.

It is not an unprimeable number, because it can be changed into a prime (6688351) 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, 668831 + ... + 668840.

It is an arithmetic number, because the mean of its divisors is an integer number (2006508).

Almost surely, 2^6688355 is an apocalyptic number.

6688355 is a deficient number, since it is larger than the sum of its proper divisors (1337677).

6688355 is a wasteful number, since it uses less digits than its factorization.

6688355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1337676.

The product of its digits is 172800, while the sum is 41.

The square root of 6688355 is about 2586.1854148533. The cubic root of 6688355 is about 188.4110798820.

The spelling of 6688355 in words is "six million, six hundred eighty-eight thousand, three hundred fifty-five".