28080181 has 2 divisors, whose sum is σ = 28080182. Its totient is φ = 28080180.

The previous prime is 28080163. The next prime is 28080211. The reversal of 28080181 is 18108082.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25341156 + 2739025 = 5034^2 + 1655^2 .

It is a cyclic number.

It is not a de Polignac number, because 28080181 - 2⁷ = 28080053 is a prime.

It is a super-2 number, since 2×28080181² = 1576993129985522, which contains 22 as substring.

It is equal to p_1746109 and since 28080181 and 1746109 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28080881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14040090 + 14040091.

It is an arithmetic number, because the mean of its divisors is an integer number (14040091).

Almost surely, 2^28080181 is an apocalyptic number.

It is an amenable number.

28080181 is a deficient number, since it is larger than the sum of its proper divisors (1).

28080181 is an equidigital number, since it uses as much as digits as its factorization.

28080181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1024, while the sum is 28.

The square root of 28080181 is about 5299.0735982811. The cubic root of 28080181 is about 303.9484742139.

The spelling of 28080181 in words is "twenty-eight million, eighty thousand, one hundred eighty-one".