6688747 has 4 divisors (see below), whose sum is σ = 7203280. Its totient is φ = 6174216.

The previous prime is 6688727. The next prime is 6688757. The reversal of 6688747 is 7478866.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7478866 = 2 ⋅3739433.

It is a cyclic number.

It is not a de Polignac number, because 6688747 - 2¹¹ = 6686699 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6688697 and 6688706.

It is not an unprimeable number, because it can be changed into a prime (6688727) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 257247 + ... + 257272.

It is an arithmetic number, because the mean of its divisors is an integer number (1800820).

Almost surely, 2^6688747 is an apocalyptic number.

6688747 is a deficient number, since it is larger than the sum of its proper divisors (514533).

6688747 is a wasteful number, since it uses less digits than its factorization.

6688747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 514532.

The product of its digits is 451584, while the sum is 46.

The square root of 6688747 is about 2586.2612010391. The cubic root of 6688747 is about 188.4147606925.

The spelling of 6688747 in words is "six million, six hundred eighty-eight thousand, seven hundred forty-seven".