28224513 has 12 divisors (see below), whose sum is σ = 40982500. Its totient is φ = 18717696.

The previous prime is 28224433. The next prime is 28224529. The reversal of 28224513 is 31542282.

It can be written as a sum of positive squares in 2 ways, for example, as 11675889 + 16548624 = 3417^2 + 4068^2 .

It is not a de Polignac number, because 28224513 - 2¹² = 28220417 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28224533) 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 11 ways as a sum of consecutive naturals, for example, 6388 + ... + 9861.

Almost surely, 2^28224513 is an apocalyptic number.

It is an amenable number.

28224513 is a deficient number, since it is larger than the sum of its proper divisors (12757987).

28224513 is a wasteful number, since it uses less digits than its factorization.

28224513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16448 (or 16445 counting only the distinct ones).

The product of its digits is 3840, while the sum is 27.

The square root of 28224513 is about 5312.6747500671. The cubic root of 28224513 is about 304.4683490928.

Adding to 28224513 its reverse (31542282), we get a palindrome (59766795).

The spelling of 28224513 in words is "twenty-eight million, two hundred twenty-four thousand, five hundred thirteen".