28146281 has 2 divisors, whose sum is σ = 28146282. Its totient is φ = 28146280.

The previous prime is 28146263. The next prime is 28146289. The reversal of 28146281 is 18264182.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27920656 + 225625 = 5284^2 + 475^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28146281 is a prime.

It is a super-2 number, since 2×28146281² = 1584426268261922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28146289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14073140 + 14073141.

It is an arithmetic number, because the mean of its divisors is an integer number (14073141).

Almost surely, 2^28146281 is an apocalyptic number.

It is an amenable number.

28146281 is a deficient number, since it is larger than the sum of its proper divisors (1).

28146281 is an equidigital number, since it uses as much as digits as its factorization.

28146281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6144, while the sum is 32.

The square root of 28146281 is about 5305.3068714260. The cubic root of 28146281 is about 304.1867828651.

The spelling of 28146281 in words is "twenty-eight million, one hundred forty-six thousand, two hundred eighty-one".