28224413 has 4 divisors (see below), whose sum is σ = 32256480. Its totient is φ = 24192348.

The previous prime is 28224407. The next prime is 28224421. The reversal of 28224413 is 31442282.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28224413 - 2¹⁰ = 28223389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28224433) 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, 2016023 + ... + 2016036.

It is an arithmetic number, because the mean of its divisors is an integer number (8064120).

Almost surely, 2^28224413 is an apocalyptic number.

It is an amenable number.

28224413 is a deficient number, since it is larger than the sum of its proper divisors (4032067).

28224413 is an equidigital number, since it uses as much as digits as its factorization.

28224413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4032066.

The product of its digits is 3072, while the sum is 26.

The square root of 28224413 is about 5312.6653386036. The cubic root of 28224413 is about 304.4679895132.

Adding to 28224413 its reverse (31442282), we get a palindrome (59666695).

The spelling of 28224413 in words is "twenty-eight million, two hundred twenty-four thousand, four hundred thirteen".