6806879891 has 8 divisors (see below), whose sum is σ = 7811842560. Its totient is φ = 5810055048.

The previous prime is 6806879881. The next prime is 6806879921. The reversal of 6806879891 is 1989786086.

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

It is a de Polignac number, because none of the positive numbers 2^k-6806879891 is a prime.

It is a super-2 number, since 2×6806879891² = 92667227701000343762, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6806879881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2032661 + ... + 2036006.

It is an arithmetic number, because the mean of its divisors is an integer number (976480320).

Almost surely, 2^6806879891 is an apocalyptic number.

6806879891 is a deficient number, since it is larger than the sum of its proper divisors (1004962669).

6806879891 is a wasteful number, since it uses less digits than its factorization.

6806879891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4068913.

The product of its (nonzero) digits is 10450944, while the sum is 62.

The square root of 6806879891 is about 82503.8174328922. The cubic root of 6806879891 is about 1895.1751906036.

The spelling of 6806879891 in words is "six billion, eight hundred six million, eight hundred seventy-nine thousand, eight hundred ninety-one".