7217328 has 40 divisors (see below), whose sum is σ = 19003248. Its totient is φ = 2359552.

The previous prime is 7217323. The next prime is 7217339. The reversal of 7217328 is 8237127.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 7217295 and 7217304.

It is not an unprimeable number, because it can be changed into a prime (7217323) 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, 1126 + ... + 3962.

Almost surely, 2^7217328 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 7217328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9501624).

7217328 is an abundant number, since it is smaller than the sum of its proper divisors (11785920).

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

7217328 is a wasteful number, since it uses less digits than its factorization.

7217328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2901 (or 2895 counting only the distinct ones).

The product of its digits is 4704, while the sum is 30.

The square root of 7217328 is about 2686.5085147827. The cubic root of 7217328 is about 193.2526602248.

The spelling of 7217328 in words is "seven million, two hundred seventeen thousand, three hundred twenty-eight".