28224447 has 4 divisors (see below), whose sum is σ = 37632600. Its totient is φ = 18816296.

The previous prime is 28224433. The next prime is 28224529. The reversal of 28224447 is 74442282.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28224447 - 2⁷ = 28224319 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28224407) 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, 4704072 + ... + 4704077.

It is an arithmetic number, because the mean of its divisors is an integer number (9408150).

Almost surely, 2^28224447 is an apocalyptic number.

28224447 is a deficient number, since it is larger than the sum of its proper divisors (9408153).

28224447 is an equidigital number, since it uses as much as digits as its factorization.

28224447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9408152.

The product of its digits is 28672, while the sum is 33.

The square root of 28224447 is about 5312.6685385030. The cubic root of 28224447 is about 304.4681117704.

The spelling of 28224447 in words is "twenty-eight million, two hundred twenty-four thousand, four hundred forty-seven".