28026181 has 2 divisors, whose sum is σ = 28026182. Its totient is φ = 28026180.

The previous prime is 28026179. The next prime is 28026191. The reversal of 28026181 is 18162082.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25250625 + 2775556 = 5025^2 + 1666^2 .

It is a cyclic number.

It is not a de Polignac number, because 28026181 - 2¹ = 28026179 is a prime.

It is a super-2 number, since 2×28026181² = 1570933642889522, which contains 22 as substring.

Together with 28026179, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28026161) 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, 14013090 + 14013091.

It is an arithmetic number, because the mean of its divisors is an integer number (14013091).

Almost surely, 2^28026181 is an apocalyptic number.

It is an amenable number.

28026181 is a deficient number, since it is larger than the sum of its proper divisors (1).

28026181 is an equidigital number, since it uses as much as digits as its factorization.

28026181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1536, while the sum is 28.

The square root of 28026181 is about 5293.9759160767. The cubic root of 28026181 is about 303.7535116757.

The spelling of 28026181 in words is "twenty-eight million, twenty-six thousand, one hundred eighty-one".