28005269 has 2 divisors, whose sum is σ = 28005270. Its totient is φ = 28005268.

The previous prime is 28005247. The next prime is 28005317. The reversal of 28005269 is 96250082.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27952369 + 52900 = 5287^2 + 230^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28005269 is a prime.

It is a super-2 number, since 2×28005269² = 1568590183524722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28005569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14002634 + 14002635.

It is an arithmetic number, because the mean of its divisors is an integer number (14002635).

Almost surely, 2^28005269 is an apocalyptic number.

It is an amenable number.

28005269 is a deficient number, since it is larger than the sum of its proper divisors (1).

28005269 is an equidigital number, since it uses as much as digits as its factorization.

28005269 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 28005269 is about 5292.0004724112. Note that the first 3 decimals coincide. The cubic root of 28005269 is about 303.6779433587.

The spelling of 28005269 in words is "twenty-eight million, five thousand, two hundred sixty-nine".