28175281 has 2 divisors, whose sum is σ = 28175282. Its totient is φ = 28175280.

The previous prime is 28175227. The next prime is 28175297. The reversal of 28175281 is 18257182.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17774656 + 10400625 = 4216^2 + 3225^2 .

It is a cyclic number.

It is not a de Polignac number, because 28175281 - 2¹³ = 28167089 is a prime.

It is a super-2 number, since 2×28175281² = 1587692918857922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28175201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14087640 + 14087641.

It is an arithmetic number, because the mean of its divisors is an integer number (14087641).

Almost surely, 2^28175281 is an apocalyptic number.

It is an amenable number.

28175281 is a deficient number, since it is larger than the sum of its proper divisors (1).

28175281 is an equidigital number, since it uses as much as digits as its factorization.

28175281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8960, while the sum is 34.

The square root of 28175281 is about 5308.0392801862. The cubic root of 28175281 is about 304.2912180807.

The spelling of 28175281 in words is "twenty-eight million, one hundred seventy-five thousand, two hundred eighty-one".