28443399 has 16 divisors (see below), whose sum is σ = 41210880. Its totient is φ = 17383680.

The previous prime is 28443379. The next prime is 28443439. The reversal of 28443399 is 99334482.

It is a happy number.

It is not a de Polignac number, because 28443399 - 2⁵ = 28443367 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28443399.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28443379) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6282 + ... + 9815.

It is an arithmetic number, because the mean of its divisors is an integer number (2575680).

Almost surely, 2^28443399 is an apocalyptic number.

28443399 is a deficient number, since it is larger than the sum of its proper divisors (12767481).

28443399 is a wasteful number, since it uses less digits than its factorization.

28443399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16150.

The product of its digits is 186624, while the sum is 42.

The square root of 28443399 is about 5333.2353220161. The cubic root of 28443399 is about 305.2533915044.

The spelling of 28443399 in words is "twenty-eight million, four hundred forty-three thousand, three hundred ninety-nine".