6520840 has 16 divisors (see below), whose sum is σ = 14671980. Its totient is φ = 2608320.

The previous prime is 6520837. The next prime is 6520847. The reversal of 6520840 is 480256.

It can be written as a sum of positive squares in 2 ways, for example, as 5225796 + 1295044 = 2286^2 + 1138^2 .

It is not an unprimeable number, because it can be changed into a prime (6520847) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 81471 + ... + 81550.

Almost surely, 2^6520840 is an apocalyptic number.

It is an amenable number.

6520840 is an abundant number, since it is smaller than the sum of its proper divisors (8151140).

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

6520840 is a wasteful number, since it uses less digits than its factorization.

6520840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163032 (or 163028 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 6520840 is about 2553.5935463578. The cubic root of 6520840 is about 186.8247951472.

The spelling of 6520840 in words is "six million, five hundred twenty thousand, eight hundred forty".