28240253 has 2 divisors, whose sum is σ = 28240254. Its totient is φ = 28240252.

The previous prime is 28240241. The next prime is 28240273. The reversal of 28240253 is 35204282.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19731364 + 8508889 = 4442^2 + 2917^2 .

It is a cyclic number.

It is not a de Polignac number, because 28240253 - 2⁴ = 28240237 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28240273) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14120126 + 14120127.

It is an arithmetic number, because the mean of its divisors is an integer number (14120127).

Almost surely, 2^28240253 is an apocalyptic number.

It is an amenable number.

28240253 is a deficient number, since it is larger than the sum of its proper divisors (1).

28240253 is an equidigital number, since it uses as much as digits as its factorization.

28240253 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3840, while the sum is 26.

The square root of 28240253 is about 5314.1559066328. The cubic root of 28240253 is about 304.5249363253.

The spelling of 28240253 in words is "twenty-eight million, two hundred forty thousand, two hundred fifty-three".