6809945670 has 128 divisors (see below), whose sum is σ = 19846010880. Its totient is φ = 1647959040.

The previous prime is 6809945657. The next prime is 6809945687. The reversal of 6809945670 is 765499086.

It is a Harshad number since it is a multiple of its sum of digits (54).

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 63 ways as a sum of consecutive naturals, for example, 1997107 + ... + 2000513.

It is an arithmetic number, because the mean of its divisors is an integer number (155046960).

Almost surely, 2^6809945670 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6809945670, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9923005440).

6809945670 is an abundant number, since it is smaller than the sum of its proper divisors (13036065210).

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

6809945670 is a wasteful number, since it uses less digits than its factorization.

6809945670 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4107 (or 4101 counting only the distinct ones).

The product of its (nonzero) digits is 3265920, while the sum is 54.

The square root of 6809945670 is about 82522.3949603985. The cubic root of 6809945670 is about 1895.4596731820.

The spelling of 6809945670 in words is "six billion, eight hundred nine million, nine hundred forty-five thousand, six hundred seventy".