7221288 has 32 divisors (see below), whose sum is σ = 18158400. Its totient is φ = 2393088.

The previous prime is 7221283. The next prime is 7221293. The reversal of 7221288 is 8821227.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (7221283) and next prime (7221293).

It is not an unprimeable number, because it can be changed into a prime (7221281) 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, 3853 + ... + 5411.

It is an arithmetic number, because the mean of its divisors is an integer number (567450).

Almost surely, 2^7221288 is an apocalyptic number.

It is an amenable number.

7221288 is an abundant number, since it is smaller than the sum of its proper divisors (10937112).

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

7221288 is a wasteful number, since it uses less digits than its factorization.

7221288 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1761 (or 1757 counting only the distinct ones).

The product of its digits is 3584, while the sum is 30.

The square root of 7221288 is about 2687.2454298035. The cubic root of 7221288 is about 193.2879983542.

The spelling of 7221288 in words is "seven million, two hundred twenty-one thousand, two hundred eighty-eight".