28871669 has 2 divisors, whose sum is σ = 28871670. Its totient is φ = 28871668.

The previous prime is 28871657. The next prime is 28871671. The reversal of 28871669 is 96617882.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24304900 + 4566769 = 4930^2 + 2137^2 .

It is a cyclic number.

It is not a de Polignac number, because 28871669 - 2⁸ = 28871413 is a prime.

It is a super-2 number, since 2×28871669² = 1667146541691122, which contains 22 as substring.

Together with 28871671, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28871069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14435834 + 14435835.

It is an arithmetic number, because the mean of its divisors is an integer number (14435835).

Almost surely, 2^28871669 is an apocalyptic number.

It is an amenable number.

28871669 is a deficient number, since it is larger than the sum of its proper divisors (1).

28871669 is an equidigital number, since it uses as much as digits as its factorization.

28871669 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 290304, while the sum is 47.

The square root of 28871669 is about 5373.2363618214. The cubic root of 28871669 is about 306.7778245167. Note that the first 3 decimals are identical.

The spelling of 28871669 in words is "twenty-eight million, eight hundred seventy-one thousand, six hundred sixty-nine".