8559220 has 36 divisors (see below), whose sum is σ = 18813060. Its totient is φ = 3270784.

The previous prime is 8559181. The next prime is 8559223. The reversal of 8559220 is 229558.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 5503716 + 3055504 = 2346^2 + 1748^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8559223) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10176 + ... + 10984.

It is an arithmetic number, because the mean of its divisors is an integer number (522585).

Almost surely, 2^8559220 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 8559220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9406530).

8559220 is an abundant number, since it is smaller than the sum of its proper divisors (10253840).

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

8559220 is a wasteful number, since it uses less digits than its factorization.

8559220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 864 (or 839 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 31.

The square root of 8559220 is about 2925.6144653730. The cubic root of 8559220 is about 204.5556108388. Note that the first 3 decimals are identical.

The spelling of 8559220 in words is "eight million, five hundred fifty-nine thousand, two hundred twenty".