28443405 has 8 divisors (see below), whose sum is σ = 45509472. Its totient is φ = 15169808.

The previous prime is 28443379. The next prime is 28443439. The reversal of 28443405 is 50434482.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28443405 - 2⁷ = 28443277 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 948099 + ... + 948128.

It is an arithmetic number, because the mean of its divisors is an integer number (5688684).

Almost surely, 2^28443405 is an apocalyptic number.

It is an amenable number.

28443405 is a deficient number, since it is larger than the sum of its proper divisors (17066067).

28443405 is a wasteful number, since it uses less digits than its factorization.

28443405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1896235.

The product of its (nonzero) digits is 15360, while the sum is 30.

The square root of 28443405 is about 5333.2358845264. The cubic root of 28443405 is about 305.2534129683.

Adding to 28443405 its reverse (50434482), we get a palindrome (78877887).

The spelling of 28443405 in words is "twenty-eight million, four hundred forty-three thousand, four hundred five".