28443299 has 4 divisors (see below), whose sum is σ = 29137080. Its totient is φ = 27749520.

The previous prime is 28443281. The next prime is 28443307. The reversal of 28443299 is 99234482.

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 28443299 - 2⁸ = 28443043 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41), and also a Moran number because the ratio is a prime number: 693739 = 28443299 / (2 + 8 + 4 + 4 + 3 + 2 + 9 + 9).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28443199) 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, 346829 + ... + 346910.

It is an arithmetic number, because the mean of its divisors is an integer number (7284270).

Almost surely, 2^28443299 is an apocalyptic number.

28443299 is a deficient number, since it is larger than the sum of its proper divisors (693781).

28443299 is an equidigital number, since it uses as much as digits as its factorization.

28443299 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 693780.

The product of its digits is 124416, while the sum is 41.

The square root of 28443299 is about 5333.2259468356. The cubic root of 28443299 is about 305.2530337720.

The spelling of 28443299 in words is "twenty-eight million, four hundred forty-three thousand, two hundred ninety-nine".