6520725 has 36 divisors (see below), whose sum is σ = 11869156. Its totient is φ = 3421440.

The previous prime is 6520699. The next prime is 6520727. The reversal of 6520725 is 5270256.

6520725 is a `hidden beast` number, since 652 + 0 + 7 + 2 + 5 = 666.

It can be written as a sum of positive squares in 6 ways, for example, as 2916 + 6517809 = 54^2 + 2553^2 .

It is not a de Polignac number, because 6520725 - 2⁵ = 6520693 is a prime.

It is a Duffinian number.

It is a plaindrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6520727) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 16227 + ... + 16623.

Almost surely, 2^6520725 is an apocalyptic number.

It is an amenable number.

6520725 is a deficient number, since it is larger than the sum of its proper divisors (5348431).

6520725 is a wasteful number, since it uses less digits than its factorization.

6520725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 486 (or 478 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 27.

The square root of 6520725 is about 2553.5710289710. The cubic root of 6520725 is about 186.8236968747.

The spelling of 6520725 in words is "six million, five hundred twenty thousand, seven hundred twenty-five".