28224799 has 4 divisors (see below), whose sum is σ = 28259280. Its totient is φ = 28190320.

The previous prime is 28224773. The next prime is 28224809. The reversal of 28224799 is 99742282.

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 28224799 - 2¹⁷ = 28093727 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 (28224739) 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, 15982 + ... + 17659.

It is an arithmetic number, because the mean of its divisors is an integer number (7064820).

Almost surely, 2^28224799 is an apocalyptic number.

28224799 is a deficient number, since it is larger than the sum of its proper divisors (34481).

28224799 is an equidigital number, since it uses as much as digits as its factorization.

28224799 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34480.

The product of its digits is 145152, while the sum is 43.

The square root of 28224799 is about 5312.7016667605. The cubic root of 28224799 is about 304.4693774855.

The spelling of 28224799 in words is "twenty-eight million, two hundred twenty-four thousand, seven hundred ninety-nine".