6805640 has 16 divisors (see below), whose sum is σ = 15312780. Its totient is φ = 2722240.

The previous prime is 6805639. The next prime is 6805649. The reversal of 6805640 is 465086.

It can be written as a sum of positive squares in 2 ways, for example, as 6041764 + 763876 = 2458^2 + 874^2 .

It is not an unprimeable number, because it can be changed into a prime (6805649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 85031 + ... + 85110.

Almost surely, 2^6805640 is an apocalyptic number.

It is an amenable number.

6805640 is an abundant number, since it is smaller than the sum of its proper divisors (8507140).

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

6805640 is a wasteful number, since it uses less digits than its factorization.

6805640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170152 (or 170148 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 6805640 is about 2608.7621585725. The cubic root of 6805640 is about 189.5060113241.

The spelling of 6805640 in words is "six million, eight hundred five thousand, six hundred forty".