28545169 has 2 divisors, whose sum is σ = 28545170. Its totient is φ = 28545168.

The previous prime is 28545161. The next prime is 28545197. The reversal of 28545169 is 96154582.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28462225 + 82944 = 5335^2 + 288^2 .

It is a cyclic number.

It is not a de Polignac number, because 28545169 - 2³ = 28545161 is a prime.

It is a super-2 number, since 2×28545169² = 1629653346477122, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28545161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14272584 + 14272585.

It is an arithmetic number, because the mean of its divisors is an integer number (14272585).

Almost surely, 2^28545169 is an apocalyptic number.

It is an amenable number.

28545169 is a deficient number, since it is larger than the sum of its proper divisors (1).

28545169 is an equidigital number, since it uses as much as digits as its factorization.

28545169 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 86400, while the sum is 40.

The square root of 28545169 is about 5342.7679156033. The cubic root of 28545169 is about 305.6170219827.

It can be divided in two parts, 285 and 45169, that added together give a palindrome (45454).

The spelling of 28545169 in words is "twenty-eight million, five hundred forty-five thousand, one hundred sixty-nine".