6810640 has 20 divisors (see below), whose sum is σ = 15834924. Its totient is φ = 2724224.

The previous prime is 6810631. The next prime is 6810653. The reversal of 6810640 is 460186.

It can be written as a sum of positive squares in 2 ways, for example, as 1648656 + 5161984 = 1284^2 + 2272^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is an unprimeable number.

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, 42487 + ... + 42646.

Almost surely, 2^6810640 is an apocalyptic number.

It is an amenable number.

6810640 is an abundant number, since it is smaller than the sum of its proper divisors (9024284).

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

6810640 is a wasteful number, since it uses less digits than its factorization.

6810640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85146 (or 85140 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 6810640 is about 2609.7202915255. The cubic root of 6810640 is about 189.5524090230.

The spelling of 6810640 in words is "six million, eight hundred ten thousand, six hundred forty".