28229471 has 2 divisors, whose sum is σ = 28229472. Its totient is φ = 28229470.

The previous prime is 28229449. The next prime is 28229501. The reversal of 28229471 is 17492282.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28229471 - 2⁶ = 28229407 is a prime.

It is a super-3 number, since 3×28229471³ (a number of 23 digits) contains 333 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28229431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14114735 + 14114736.

It is an arithmetic number, because the mean of its divisors is an integer number (14114736).

Almost surely, 2^28229471 is an apocalyptic number.

28229471 is a deficient number, since it is larger than the sum of its proper divisors (1).

28229471 is an equidigital number, since it uses as much as digits as its factorization.

28229471 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16128, while the sum is 35.

The square root of 28229471 is about 5313.1413495220. The cubic root of 28229471 is about 304.4861759807.

The spelling of 28229471 in words is "twenty-eight million, two hundred twenty-nine thousand, four hundred seventy-one".