8221716 has 48 divisors (see below), whose sum is σ = 21470400. Its totient is φ = 2720736.

The previous prime is 8221669. The next prime is 8221721. The reversal of 8221716 is 6171228.

It is a super-2 number, since 2×8221716² = 135193227969312, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 8221716.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28911 + ... + 29193.

It is an arithmetic number, because the mean of its divisors is an integer number (447300).

Almost surely, 2^8221716 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 8221716, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10735200).

8221716 is an abundant number, since it is smaller than the sum of its proper divisors (13248684).

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

8221716 is a wasteful number, since it uses less digits than its factorization.

8221716 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 565 (or 557 counting only the distinct ones).

The product of its digits is 1344, while the sum is 27.

The square root of 8221716 is about 2867.3534836152. The cubic root of 8221716 is about 201.8308226361.

The spelling of 8221716 in words is "eight million, two hundred twenty-one thousand, seven hundred sixteen".