28443407 has 6 divisors (see below), whose sum is σ = 28749168. Its totient is φ = 28140864.

The previous prime is 28443379. The next prime is 28443439. The reversal of 28443407 is 70434482.

It is not a de Polignac number, because 28443407 - 2¹⁴ = 28427023 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 (28443497) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7898 + ... + 10920.

It is an arithmetic number, because the mean of its divisors is an integer number (4791528).

Almost surely, 2^28443407 is an apocalyptic number.

28443407 is a deficient number, since it is larger than the sum of its proper divisors (305761).

28443407 is an frugal number, since it uses more digits than its factorization.

28443407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3217 (or 3120 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 32.

The square root of 28443407 is about 5333.2360720298. The cubic root of 28443407 is about 305.2534201230.

Adding to 28443407 its reverse (70434482), we get a palindrome (98877889).

The spelling of 28443407 in words is "twenty-eight million, four hundred forty-three thousand, four hundred seven".