6520740 has 48 divisors (see below), whose sum is σ = 18385920. Its totient is φ = 1726720.

The previous prime is 6520727. The next prime is 6520747. The reversal of 6520740 is 470256.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 6520740.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6520747) 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, 11176 + ... + 11744.

It is an arithmetic number, because the mean of its divisors is an integer number (383040).

Almost surely, 2^6520740 is an apocalyptic number.

6520740 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6520740 is an abundant number, since it is smaller than the sum of its proper divisors (11865180).

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

6520740 is a wasteful number, since it uses less digits than its factorization.

6520740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 772 (or 770 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 24.

The square root of 6520740 is about 2553.5739660327. The cubic root of 6520740 is about 186.8238401284.

Adding to 6520740 its reverse (470256), we get a palindrome (6990996).

It can be divided in two parts, 6520 and 740, that added together give a triangular number (7260 = T₁₂₀).

The spelling of 6520740 in words is "six million, five hundred twenty thousand, seven hundred forty".