9720224 has 24 divisors (see below), whose sum is σ = 19357380. Its totient is φ = 4804096.

The previous prime is 9720223. The next prime is 9720247. The reversal of 9720224 is 4220279.

It can be written as a sum of positive squares in 2 ways, for example, as 9610000 + 110224 = 3100^2 + 332^2 .

It is a super-2 number, since 2×9720224² = 188965509220352, which contains 22 as substring.

It is a zygodrome in base 15.

It is a junction number, because it is equal to n+sod(n) for n = 9720193 and 9720202.

It is not an unprimeable number, because it can be changed into a prime (9720223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1142 + ... + 4554.

Almost surely, 2^9720224 is an apocalyptic number.

It is an amenable number.

9720224 is a deficient number, since it is larger than the sum of its proper divisors (9637156).

9720224 is a wasteful number, since it uses less digits than its factorization.

9720224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3512 (or 3504 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 9720224 is about 3117.7273774338. The cubic root of 9720224 is about 213.4152376480.

Subtracting from 9720224 its reverse (4220279), we obtain a palindrome (5499945).

The spelling of 9720224 in words is "nine million, seven hundred twenty thousand, two hundred twenty-four".