28003449 has 8 divisors (see below), whose sum is σ = 38206432. Its totient is φ = 18234720.

The previous prime is 28003441. The next prime is 28003483. The reversal of 28003449 is 94430082.

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 28003449 - 2³ = 28003441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28003441) 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, 108412 + ... + 108669.

It is an arithmetic number, because the mean of its divisors is an integer number (4775804).

Almost surely, 2^28003449 is an apocalyptic number.

It is an amenable number.

28003449 is a deficient number, since it is larger than the sum of its proper divisors (10202983).

28003449 is a wasteful number, since it uses less digits than its factorization.

28003449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217127.

The product of its (nonzero) digits is 6912, while the sum is 30.

The square root of 28003449 is about 5291.8285119607. The cubic root of 28003449 is about 303.6713647654.

The spelling of 28003449 in words is "twenty-eight million, three thousand, four hundred forty-nine".