6689855 has 4 divisors (see below), whose sum is σ = 8027832. Its totient is φ = 5351880.

The previous prime is 6689821. The next prime is 6689869. The reversal of 6689855 is 5589866.

It is a happy number.

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

It is not a de Polignac number, because 6689855 - 2⁶ = 6689791 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 668981 + ... + 668990.

It is an arithmetic number, because the mean of its divisors is an integer number (2006958).

Almost surely, 2^6689855 is an apocalyptic number.

6689855 is a deficient number, since it is larger than the sum of its proper divisors (1337977).

6689855 is a wasteful number, since it uses less digits than its factorization.

6689855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1337976.

The product of its digits is 518400, while the sum is 47.

The square root of 6689855 is about 2586.4754010042. The cubic root of 6689855 is about 188.4251638381.

The spelling of 6689855 in words is "six million, six hundred eighty-nine thousand, eight hundred fifty-five".