6689669 has 8 divisors (see below), whose sum is σ = 7662720. Its totient is φ = 5720976.

The previous prime is 6689659. The next prime is 6689681. The reversal of 6689669 is 9669866.

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

It is a cyclic number.

It is not a de Polignac number, because 6689669 - 2⁸ = 6689413 is a prime.

It is a super-2 number, since 2×6689669² = 89503342659122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6689629) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3512 + ... + 5070.

It is an arithmetic number, because the mean of its divisors is an integer number (957840).

Almost surely, 2^6689669 is an apocalyptic number.

It is an amenable number.

6689669 is a deficient number, since it is larger than the sum of its proper divisors (973051).

6689669 is a wasteful number, since it uses less digits than its factorization.

6689669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2179.

The product of its digits is 839808, while the sum is 50.

The square root of 6689669 is about 2586.4394444873. The cubic root of 6689669 is about 188.4234175419.

The spelling of 6689669 in words is "six million, six hundred eighty-nine thousand, six hundred sixty-nine".