28443885 has 8 divisors (see below), whose sum is σ = 45510240. Its totient is φ = 15170064.

The previous prime is 28443869. The next prime is 28443887. The reversal of 28443885 is 58834482.

It is a happy number.

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

It is not a de Polignac number, because 28443885 - 2⁴ = 28443869 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28443887) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 948115 + ... + 948144.

It is an arithmetic number, because the mean of its divisors is an integer number (5688780).

Almost surely, 2^28443885 is an apocalyptic number.

It is an amenable number.

28443885 is a deficient number, since it is larger than the sum of its proper divisors (17066355).

28443885 is a wasteful number, since it uses less digits than its factorization.

28443885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1896267.

The product of its digits is 245760, while the sum is 42.

The square root of 28443885 is about 5333.2808851588. The cubic root of 28443885 is about 305.2551300719.

The spelling of 28443885 in words is "twenty-eight million, four hundred forty-three thousand, eight hundred eighty-five".