8581216 has 48 divisors (see below), whose sum is σ = 19988640. Its totient is φ = 3548160.

The previous prime is 8581211. The next prime is 8581241. The reversal of 8581216 is 6121858.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8581211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5836 + ... + 7156.

It is an arithmetic number, because the mean of its divisors is an integer number (416430).

Almost surely, 2^8581216 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 8581216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9994320).

8581216 is an abundant number, since it is smaller than the sum of its proper divisors (11407424).

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

8581216 is a wasteful number, since it uses less digits than its factorization.

8581216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1367 (or 1359 counting only the distinct ones).

The product of its digits is 3840, while the sum is 31.

The square root of 8581216 is about 2929.3712635991. The cubic root of 8581216 is about 204.7306874006.

The spelling of 8581216 in words is "eight million, five hundred eighty-one thousand, two hundred sixteen".