6564220 has 24 divisors (see below), whose sum is σ = 14845824. Its totient is φ = 2423616.

The previous prime is 6564211. The next prime is 6564241. The reversal of 6564220 is 224656.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12364 + ... + 12883.

It is an arithmetic number, because the mean of its divisors is an integer number (618576).

Almost surely, 2^6564220 is an apocalyptic number.

It is an amenable number.

6564220 is an abundant number, since it is smaller than the sum of its proper divisors (8281604).

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

6564220 is a wasteful number, since it uses less digits than its factorization.

6564220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25269 (or 25267 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 6564220 is about 2562.0733791209. The cubic root of 6564220 is about 187.2381648999.

Adding to 6564220 its reverse (224656), we get a palindrome (6788876).

The spelling of 6564220 in words is "six million, five hundred sixty-four thousand, two hundred twenty".