28301281 has 2 divisors, whose sum is σ = 28301282. Its totient is φ = 28301280.

The previous prime is 28301249. The next prime is 28301309. The reversal of 28301281 is 18210382.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16329681 + 11971600 = 4041^2 + 3460^2 .

It is a cyclic number.

It is not a de Polignac number, because 28301281 - 2⁵ = 28301249 is a prime.

It is a super-2 number, since 2×28301281² = 1601925012481922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28301081) 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, 14150640 + 14150641.

It is an arithmetic number, because the mean of its divisors is an integer number (14150641).

Almost surely, 2^28301281 is an apocalyptic number.

It is an amenable number.

28301281 is a deficient number, since it is larger than the sum of its proper divisors (1).

28301281 is an equidigital number, since it uses as much as digits as its factorization.

28301281 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 768, while the sum is 25.

The square root of 28301281 is about 5319.8948297875. The cubic root of 28301281 is about 304.7441408843.

It can be divided in two parts, 28301 and 281, that added together give a palindrome (28582).

The spelling of 28301281 in words is "twenty-eight million, three hundred one thousand, two hundred eighty-one".