6891688812 has 24 divisors (see below), whose sum is σ = 16779764736. Its totient is φ = 2197349968.

The previous prime is 6891688807. The next prime is 6891688813. The reversal of 6891688812 is 2188861986.

It is not an unprimeable number, because it can be changed into a prime (6891688813) 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, 12484668 + ... + 12485219.

It is an arithmetic number, because the mean of its divisors is an integer number (699156864).

Almost surely, 2^6891688812 is an apocalyptic number.

It is an amenable number.

6891688812 is an abundant number, since it is smaller than the sum of its proper divisors (9888075924).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6891688812 is a wasteful number, since it uses less digits than its factorization.

6891688812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24969917 (or 24969915 counting only the distinct ones).

The product of its digits is 2654208, while the sum is 57.

The square root of 6891688812 is about 83016.1960824513. The cubic root of 6891688812 is about 1903.0135751902.

The spelling of 6891688812 in words is "six billion, eight hundred ninety-one million, six hundred eighty-eight thousand, eight hundred twelve".