28887449 has 2 divisors, whose sum is σ = 28887450. Its totient is φ = 28887448.

The previous prime is 28887407. The next prime is 28887457. The reversal of 28887449 is 94478882.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28090000 + 797449 = 5300^2 + 893^2 .

It is a cyclic number.

It is not a de Polignac number, because 28887449 - 2⁸ = 28887193 is a prime.

It is a super-3 number, since 3×28887449³ (a number of 23 digits) contains 333 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 28887397 and 28887406.

It is not a weakly prime, because it can be changed into another prime (28887479) 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 as a sum of consecutive naturals, namely, 14443724 + 14443725.

It is an arithmetic number, because the mean of its divisors is an integer number (14443725).

Almost surely, 2^28887449 is an apocalyptic number.

It is an amenable number.

28887449 is a deficient number, since it is larger than the sum of its proper divisors (1).

28887449 is an equidigital number, since it uses as much as digits as its factorization.

28887449 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1032192, while the sum is 50.

The square root of 28887449 is about 5374.7045500195. The cubic root of 28887449 is about 306.8337048145.

The spelling of 28887449 in words is "twenty-eight million, eight hundred eighty-seven thousand, four hundred forty-nine".