28036181 has 2 divisors, whose sum is σ = 28036182. Its totient is φ = 28036180.

The previous prime is 28036171. The next prime is 28036187. The reversal of 28036181 is 18163082.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27133681 + 902500 = 5209^2 + 950^2 .

It is a cyclic number.

It is not a de Polignac number, because 28036181 - 2⁶ = 28036117 is a prime.

It is a super-2 number, since 2×28036181² = 1572054890129522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28036187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14018090 + 14018091.

It is an arithmetic number, because the mean of its divisors is an integer number (14018091).

Almost surely, 2^28036181 is an apocalyptic number.

It is an amenable number.

28036181 is a deficient number, since it is larger than the sum of its proper divisors (1).

28036181 is an equidigital number, since it uses as much as digits as its factorization.

28036181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 28036181 is about 5294.9203015721. The cubic root of 28036181 is about 303.7896347316.

The spelling of 28036181 in words is "twenty-eight million, thirty-six thousand, one hundred eighty-one".