6921740808 has 96 divisors (see below), whose sum is σ = 19865813760. Its totient is φ = 2169699840.

The previous prime is 6921740803. The next prime is 6921740887. The reversal of 6921740808 is 8080471296.

It is a Cunningham number, because it is equal to 83197²-1.

It is not an unprimeable number, because it can be changed into a prime (6921740803) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2827441 + ... + 2829887.

It is an arithmetic number, because the mean of its divisors is an integer number (206935560).

Almost surely, 2^6921740808 is an apocalyptic number.

6921740808 is a gapful number since it is divisible by the number (68) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6921740808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9932906880).

6921740808 is an abundant number, since it is smaller than the sum of its proper divisors (12944072952).

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

6921740808 is a wasteful number, since it uses less digits than its factorization.

6921740808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4787 (or 4780 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 45.

The square root of 6921740808 is about 83196.9999939902. Note that the first 5 decimals coincide. The cubic root of 6921740808 is about 1905.7756669308.

The spelling of 6921740808 in words is "six billion, nine hundred twenty-one million, seven hundred forty thousand, eight hundred eight".