6688634 has 4 divisors (see below), whose sum is σ = 10032954. Its totient is φ = 3344316.

The previous prime is 6688631. The next prime is 6688639. The reversal of 6688634 is 4368866.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 5359225 + 1329409 = 2315^2 + 1153^2 .

It is a junction number, because it is equal to n+sod(n) for n = 6688591 and 6688600.

It is not an unprimeable number, because it can be changed into a prime (6688631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1672157 + ... + 1672160.

Almost surely, 2^6688634 is an apocalyptic number.

6688634 is a deficient number, since it is larger than the sum of its proper divisors (3344320).

6688634 is a wasteful number, since it uses less digits than its factorization.

6688634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3344319.

The product of its digits is 165888, while the sum is 41.

The square root of 6688634 is about 2586.2393547388. The cubic root of 6688634 is about 188.4136996573.

The spelling of 6688634 in words is "six million, six hundred eighty-eight thousand, six hundred thirty-four".