8222720 has 96 divisors (see below), whose sum is σ = 21818160. Its totient is φ = 2949120.

The previous prime is 8222717. The next prime is 8222737. The reversal of 8222720 is 272228.

It is a happy number.

It is a super-2 number, since 2×8222720² = 135226248396800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 112604 + ... + 112676.

Almost surely, 2^8222720 is an apocalyptic number.

8222720 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 8222720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10909080).

8222720 is an abundant number, since it is smaller than the sum of its proper divisors (13595440).

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

8222720 is a wasteful number, since it uses less digits than its factorization.

8222720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111 (or 91 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 23.

The square root of 8222720 is about 2867.5285526041. The cubic root of 8222720 is about 201.8390378675.

Adding to 8222720 its reverse (272228), we get a palindrome (8494948).

The spelling of 8222720 in words is "eight million, two hundred twenty-two thousand, seven hundred twenty".