6520564 has 6 divisors (see below), whose sum is σ = 11410994. Its totient is φ = 3260280.

The previous prime is 6520541. The next prime is 6520567. The reversal of 6520564 is 4650256.

It can be written as a sum of positive squares in only one way, i.e., 5560164 + 960400 = 2358^2 + 980^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6520567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 815067 + ... + 815074.

Almost surely, 2^6520564 is an apocalyptic number.

It is an amenable number.

6520564 is a deficient number, since it is larger than the sum of its proper divisors (4890430).

6520564 is a wasteful number, since it uses less digits than its factorization.

6520564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1630145 (or 1630143 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 28.

The square root of 6520564 is about 2553.5395042959. The cubic root of 6520564 is about 186.8221592715.

The spelling of 6520564 in words is "six million, five hundred twenty thousand, five hundred sixty-four".