8618220 has 144 divisors (see below), whose sum is σ = 29352960. Its totient is φ = 2032128.

The previous prime is 8618213. The next prime is 8618221. The reversal of 8618220 is 228168.

It is not an unprimeable number, because it can be changed into a prime (8618221) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 67797 + ... + 67923.

It is an arithmetic number, because the mean of its divisors is an integer number (203840).

Almost surely, 2^8618220 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 8618220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14676480).

8618220 is an abundant number, since it is smaller than the sum of its proper divisors (20734740).

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

8618220 is a wasteful number, since it uses less digits than its factorization.

8618220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 184 (or 179 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

The square root of 8618220 is about 2935.6805003270. The cubic root of 8618220 is about 205.0245459405.

The spelling of 8618220 in words is "eight million, six hundred eighteen thousand, two hundred twenty".