28874449 has 4 divisors (see below), whose sum is σ = 30572964. Its totient is φ = 27175936.

The previous prime is 28874441. The next prime is 28874477. The reversal of 28874449 is 94447882.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 94447882 = 2 ⋅47223941.

It can be written as a sum of positive squares in 2 ways, for example, as 16321600 + 12552849 = 4040^2 + 3543^2 .

It is a cyclic number.

It is not a de Polignac number, because 28874449 - 2³ = 28874441 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28874399 and 28874408.

It is not an unprimeable number, because it can be changed into a prime (28874441) 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 3 ways as a sum of consecutive naturals, for example, 849232 + ... + 849265.

It is an arithmetic number, because the mean of its divisors is an integer number (7643241).

Almost surely, 2^28874449 is an apocalyptic number.

It is an amenable number.

28874449 is a deficient number, since it is larger than the sum of its proper divisors (1698515).

28874449 is a wasteful number, since it uses less digits than its factorization.

28874449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1698514.

The product of its digits is 516096, while the sum is 46.

The square root of 28874449 is about 5373.4950451266. The cubic root of 28874449 is about 306.7876705585.

The spelling of 28874449 in words is "twenty-eight million, eight hundred seventy-four thousand, four hundred forty-nine".