28539449 has 2 divisors, whose sum is σ = 28539450. Its totient is φ = 28539448.

The previous prime is 28539431. The next prime is 28539479. The reversal of 28539449 is 94493582.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25050025 + 3489424 = 5005^2 + 1868^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28539449 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28539409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14269724 + 14269725.

It is an arithmetic number, because the mean of its divisors is an integer number (14269725).

Almost surely, 2^28539449 is an apocalyptic number.

It is an amenable number.

28539449 is a deficient number, since it is larger than the sum of its proper divisors (1).

28539449 is an equidigital number, since it uses as much as digits as its factorization.

28539449 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 311040, while the sum is 44.

The square root of 28539449 is about 5342.2325857267. The cubic root of 28539449 is about 305.5966070146.

The spelling of 28539449 in words is "twenty-eight million, five hundred thirty-nine thousand, four hundred forty-nine".