6688609 has 4 divisors (see below), whose sum is σ = 6710704. Its totient is φ = 6666516.

The previous prime is 6688603. The next prime is 6688631. The reversal of 6688609 is 9068866.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 6688609 - 2⁷ = 6688481 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6688603) 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, 10587 + ... + 11200.

It is an arithmetic number, because the mean of its divisors is an integer number (1677676).

Almost surely, 2^6688609 is an apocalyptic number.

It is an amenable number.

6688609 is a deficient number, since it is larger than the sum of its proper divisors (22095).

6688609 is a wasteful number, since it uses less digits than its factorization.

6688609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22094.

The product of its (nonzero) digits is 124416, while the sum is 43.

The square root of 6688609 is about 2586.2345214617. The cubic root of 6688609 is about 188.4134649134.

The spelling of 6688609 in words is "six million, six hundred eighty-eight thousand, six hundred nine".