8220864 has 56 divisors (see below), whose sum is σ = 22238208. Its totient is φ = 2679040.

The previous prime is 8220853. The next prime is 8220881. The reversal of 8220864 is 4680228.

It is a happy number.

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, 8569 + ... + 9479.

Almost surely, 2^8220864 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 8220864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11119104).

8220864 is an abundant number, since it is smaller than the sum of its proper divisors (14017344).

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

8220864 is a wasteful number, since it uses less digits than its factorization.

8220864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 973 (or 963 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 30.

The square root of 8220864 is about 2867.2049107101. The cubic root of 8220864 is about 201.8238506203.

The spelling of 8220864 in words is "eight million, two hundred twenty thousand, eight hundred sixty-four".