6688816 has 10 divisors (see below), whose sum is σ = 12959612. Its totient is φ = 3344400.

The previous prime is 6688813. The next prime is 6688831. The reversal of 6688816 is 6188866.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (6688813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 209010 + ... + 209041.

Almost surely, 2^6688816 is an apocalyptic number.

It is an amenable number.

6688816 is a deficient number, since it is larger than the sum of its proper divisors (6270796).

6688816 is a wasteful number, since it uses less digits than its factorization.

6688816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 418059 (or 418053 counting only the distinct ones).

The product of its digits is 110592, while the sum is 43.

The square root of 6688816 is about 2586.2745407246. The cubic root of 6688816 is about 188.4154085753.

The spelling of 6688816 in words is "six million, six hundred eighty-eight thousand, eight hundred sixteen".