28253549 has 2 divisors, whose sum is σ = 28253550. Its totient is φ = 28253548.

The previous prime is 28253521. The next prime is 28253567. The reversal of 28253549 is 94535282.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27899524 + 354025 = 5282^2 + 595^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28253549 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28253749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14126774 + 14126775.

It is an arithmetic number, because the mean of its divisors is an integer number (14126775).

Almost surely, 2^28253549 is an apocalyptic number.

It is an amenable number.

28253549 is a deficient number, since it is larger than the sum of its proper divisors (1).

28253549 is an equidigital number, since it uses as much as digits as its factorization.

28253549 is an evil number, because the sum of its binary digits is even.

The product of its digits is 86400, while the sum is 38.

The square root of 28253549 is about 5315.4067577185. The cubic root of 28253549 is about 304.5727206975.

The spelling of 28253549 in words is "twenty-eight million, two hundred fifty-three thousand, five hundred forty-nine".