28945449 has 24 divisors (see below), whose sum is σ = 45656520. Its totient is φ = 17563392.

The previous prime is 28945447. The next prime is 28945453. The reversal of 28945449 is 94454982.

It can be written as a sum of positive squares in 4 ways, for example, as 7601049 + 21344400 = 2757^2 + 4620^2 .

It is not a de Polignac number, because 28945449 - 2¹ = 28945447 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28945447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6847 + ... + 10235.

It is an arithmetic number, because the mean of its divisors is an integer number (1902355).

Almost surely, 2^28945449 is an apocalyptic number.

It is an amenable number.

28945449 is a deficient number, since it is larger than the sum of its proper divisors (16711071).

28945449 is a wasteful number, since it uses less digits than its factorization.

28945449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3481 (or 3478 counting only the distinct ones).

The product of its digits is 414720, while the sum is 45.

The square root of 28945449 is about 5380.0974898230. The cubic root of 28945449 is about 307.0389203239.

The spelling of 28945449 in words is "twenty-eight million, nine hundred forty-five thousand, four hundred forty-nine".