7225220 has 48 divisors (see below), whose sum is σ = 16087680. Its totient is φ = 2720256.

The previous prime is 7225217. The next prime is 7225241. The reversal of 7225220 is 225227.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 7225192 and 7225201.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51911 + ... + 52049.

It is an arithmetic number, because the mean of its divisors is an integer number (335160).

Almost surely, 2^7225220 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 7225220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8043840).

7225220 is an abundant number, since it is smaller than the sum of its proper divisors (8862460).

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

7225220 is a wasteful number, since it uses less digits than its factorization.

7225220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 284 (or 282 counting only the distinct ones).

The product of its (nonzero) digits is 560, while the sum is 20.

The square root of 7225220 is about 2687.9769344248. The cubic root of 7225220 is about 193.3230738379.

The spelling of 7225220 in words is "seven million, two hundred twenty-five thousand, two hundred twenty".