28420169 has 2 divisors, whose sum is σ = 28420170. Its totient is φ = 28420168.

The previous prime is 28420159. The next prime is 28420193. The reversal of 28420169 is 96102482.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15366400 + 13053769 = 3920^2 + 3613^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28420169 is a prime.

It is a super-2 number, since 2×28420169² = 1615412011977122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28420109) 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, 14210084 + 14210085.

It is an arithmetic number, because the mean of its divisors is an integer number (14210085).

Almost surely, 2^28420169 is an apocalyptic number.

It is an amenable number.

28420169 is a deficient number, since it is larger than the sum of its proper divisors (1).

28420169 is an equidigital number, since it uses as much as digits as its factorization.

28420169 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 28420169 is about 5331.0570246434. The cubic root of 28420169 is about 305.1702677352.

The spelling of 28420169 in words is "twenty-eight million, four hundred twenty thousand, one hundred sixty-nine".