6540685 has 4 divisors (see below), whose sum is σ = 7848828. Its totient is φ = 5232544.

The previous prime is 6540679. The next prime is 6540691. The reversal of 6540685 is 5860456.

6540685 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (6540679) and next prime (6540691).

It can be written as a sum of positive squares in 2 ways, for example, as 4726276 + 1814409 = 2174^2 + 1347^2 .

It is a cyclic number.

It is not a de Polignac number, because 6540685 - 2⁷ = 6540557 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6540685.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 654064 + ... + 654073.

It is an arithmetic number, because the mean of its divisors is an integer number (1962207).

Almost surely, 2^6540685 is an apocalyptic number.

It is an amenable number.

6540685 is a deficient number, since it is larger than the sum of its proper divisors (1308143).

6540685 is a wasteful number, since it uses less digits than its factorization.

6540685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1308142.

The product of its (nonzero) digits is 28800, while the sum is 34.

The square root of 6540685 is about 2557.4762951003. The cubic root of 6540685 is about 187.0141257310.

It can be divided in two parts, 6540 and 685, that added together give a square (7225 = 85²).

The spelling of 6540685 in words is "six million, five hundred forty thousand, six hundred eighty-five".