28543549 has 2 divisors, whose sum is σ = 28543550. Its totient is φ = 28543548.

The previous prime is 28543517. The next prime is 28543577. The reversal of 28543549 is 94534582.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18335524 + 10208025 = 4282^2 + 3195^2 .

It is a cyclic number.

It is not a de Polignac number, because 28543549 - 2⁵ = 28543517 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28543579) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14271774 + 14271775.

It is an arithmetic number, because the mean of its divisors is an integer number (14271775).

Almost surely, 2^28543549 is an apocalyptic number.

It is an amenable number.

28543549 is a deficient number, since it is larger than the sum of its proper divisors (1).

28543549 is an equidigital number, since it uses as much as digits as its factorization.

28543549 is an evil number, because the sum of its binary digits is even.

The product of its digits is 172800, while the sum is 40.

The square root of 28543549 is about 5342.6163066423. The cubic root of 28543549 is about 305.6112403980.

It can be divided in two parts, 28543 and 549, that added together give a palindrome (29092).

The spelling of 28543549 in words is "twenty-eight million, five hundred forty-three thousand, five hundred forty-nine".