6688646 has 8 divisors (see below), whose sum is σ = 10561080. Its totient is φ = 3168288.

The previous prime is 6688639. The next prime is 6688651. The reversal of 6688646 is 6468866.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 6688597 and 6688606.

It is a congruent number.

It is an unprimeable number.

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, 87971 + ... + 88046.

It is an arithmetic number, because the mean of its divisors is an integer number (1320135).

Almost surely, 2^6688646 is an apocalyptic number.

6688646 is a deficient number, since it is larger than the sum of its proper divisors (3872434).

6688646 is a wasteful number, since it uses less digits than its factorization.

6688646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 176038.

The product of its digits is 331776, while the sum is 44.

The square root of 6688646 is about 2586.2416747087. The cubic root of 6688646 is about 188.4138123341.

The spelling of 6688646 in words is "six million, six hundred eighty-eight thousand, six hundred forty-six".