6684540 has 24 divisors (see below), whose sum is σ = 18716880. Its totient is φ = 1782528.

The previous prime is 6684527. The next prime is 6684541. The reversal of 6684540 is 454866.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6684541) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 55645 + ... + 55764.

It is an arithmetic number, because the mean of its divisors is an integer number (779870).

Almost surely, 2^6684540 is an apocalyptic number.

6684540 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6684540 is an abundant number, since it is smaller than the sum of its proper divisors (12032340).

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

6684540 is a wasteful number, since it uses less digits than its factorization.

6684540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111421 (or 111419 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 33.

The square root of 6684540 is about 2585.4477368533. The cubic root of 6684540 is about 188.3752501961.

The spelling of 6684540 in words is "six million, six hundred eighty-four thousand, five hundred forty".