6561320 has 32 divisors (see below), whose sum is σ = 15633000. Its totient is φ = 2469888.

The previous prime is 6561319. The next prime is 6561383. The reversal of 6561320 is 231656.

It can be written as a sum of positive squares in 4 ways, for example, as 4813636 + 1747684 = 2194^2 + 1322^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4145 + ... + 5504.

Almost surely, 2^6561320 is an apocalyptic number.

It is an amenable number.

6561320 is an abundant number, since it is smaller than the sum of its proper divisors (9071680).

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

6561320 is a wasteful number, since it uses less digits than its factorization.

6561320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9677 (or 9673 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 6561320 is about 2561.5073687187. The cubic root of 6561320 is about 187.2105875863.

Adding to 6561320 its reverse (231656), we get a palindrome (6792976).

The spelling of 6561320 in words is "six million, five hundred sixty-one thousand, three hundred twenty".