6781885 has 8 divisors (see below), whose sum is σ = 8878176. Its totient is φ = 4932240.

The previous prime is 6781867. The next prime is 6781891. The reversal of 6781885 is 5881876.

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

It is not a de Polignac number, because 6781885 - 2¹¹ = 6779837 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a nialpdrome in base 14.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 61599 + ... + 61708.

It is an arithmetic number, because the mean of its divisors is an integer number (1109772).

Almost surely, 2^6781885 is an apocalyptic number.

It is an amenable number.

6781885 is a deficient number, since it is larger than the sum of its proper divisors (2096291).

6781885 is a wasteful number, since it uses less digits than its factorization.

6781885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123323.

The product of its digits is 107520, while the sum is 43.

The square root of 6781885 is about 2604.2052530475. The cubic root of 6781885 is about 189.2852648449.

Subtracting from 6781885 its reverse (5881876), we obtain a palindrome (900009).

The spelling of 6781885 in words is "six million, seven hundred eighty-one thousand, eight hundred eighty-five".