6520540 has 48 divisors (see below), whose sum is σ = 15240960. Its totient is φ = 2327040.

The previous prime is 6520519. The next prime is 6520541. The reversal of 6520540 is 450256.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6520541) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7656 + ... + 8464.

It is an arithmetic number, because the mean of its divisors is an integer number (317520).

Almost surely, 2^6520540 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6520540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7620480).

6520540 is an abundant number, since it is smaller than the sum of its proper divisors (8720420).

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

6520540 is a wasteful number, since it uses less digits than its factorization.

6520540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 862 (or 860 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 22.

The square root of 6520540 is about 2553.5348049322. The cubic root of 6520540 is about 186.8219300614.

Adding to 6520540 its reverse (450256), we get a palindrome (6970796).

The spelling of 6520540 in words is "six million, five hundred twenty thousand, five hundred forty".