7281224 has 16 divisors (see below), whose sum is σ = 13733820. Its totient is φ = 3618880.

The previous prime is 7281223. The next prime is 7281229. The reversal of 7281224 is 4221827.

It can be written as a sum of positive squares in 2 ways, for example, as 6340324 + 940900 = 2518^2 + 970^2 .

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 7281193 and 7281202.

It is not an unprimeable number, because it can be changed into a prime (7281223) 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 3 ways as a sum of consecutive naturals, for example, 1247 + ... + 4014.

Almost surely, 2^7281224 is an apocalyptic number.

It is an amenable number.

7281224 is a deficient number, since it is larger than the sum of its proper divisors (6452596).

7281224 is a wasteful number, since it uses less digits than its factorization.

7281224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5440 (or 5436 counting only the distinct ones).

The product of its digits is 1792, while the sum is 26.

The square root of 7281224 is about 2698.3743254041. The cubic root of 7281224 is about 193.8212829627.

The spelling of 7281224 in words is "seven million, two hundred eighty-one thousand, two hundred twenty-four".