28918449 has 12 divisors (see below), whose sum is σ = 47738496. Its totient is φ = 16524792.

The previous prime is 28918441. The next prime is 28918451. The reversal of 28918449 is 94481982.

It is not a de Polignac number, because 28918449 - 2³ = 28918441 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28918441) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 229449 + ... + 229574.

It is an arithmetic number, because the mean of its divisors is an integer number (3978208).

Almost surely, 2^28918449 is an apocalyptic number.

It is an amenable number.

28918449 is a deficient number, since it is larger than the sum of its proper divisors (18820047).

28918449 is a wasteful number, since it uses less digits than its factorization.

28918449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 459036 (or 459033 counting only the distinct ones).

The product of its digits is 165888, while the sum is 45.

The square root of 28918449 is about 5377.5876561893. The cubic root of 28918449 is about 306.9434231030.

The spelling of 28918449 in words is "twenty-eight million, nine hundred eighteen thousand, four hundred forty-nine".