7215320 has 64 divisors (see below), whose sum is σ = 18861120. Its totient is φ = 2433024.

The previous prime is 7215301. The next prime is 7215323. The reversal of 7215320 is 235127.

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 = 7215292 and 7215301.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7215323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20264 + ... + 20616.

It is an arithmetic number, because the mean of its divisors is an integer number (294705).

Almost surely, 2^7215320 is an apocalyptic number.

7215320 is a gapful number since it is divisible by the number (70) 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 7215320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9430560).

7215320 is an abundant number, since it is smaller than the sum of its proper divisors (11645800).

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

7215320 is a wasteful number, since it uses less digits than its factorization.

7215320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 444 (or 440 counting only the distinct ones).

The product of its (nonzero) digits is 420, while the sum is 20.

The square root of 7215320 is about 2686.1347695155. The cubic root of 7215320 is about 193.2347363553.

The spelling of 7215320 in words is "seven million, two hundred fifteen thousand, three hundred twenty".