28298869 has 2 divisors, whose sum is σ = 28298870. Its totient is φ = 28298868.

The previous prime is 28298861. The next prime is 28298899. The reversal of 28298869 is 96889282.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14326225 + 13972644 = 3785^2 + 3738^2 .

It is a cyclic number.

It is not a de Polignac number, because 28298869 - 2³ = 28298861 is a prime.

It is a super-2 number, since 2×28298869² = 1601651973358322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28298861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14149434 + 14149435.

It is an arithmetic number, because the mean of its divisors is an integer number (14149435).

Almost surely, 2^28298869 is an apocalyptic number.

It is an amenable number.

28298869 is a deficient number, since it is larger than the sum of its proper divisors (1).

28298869 is an equidigital number, since it uses as much as digits as its factorization.

28298869 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 995328, while the sum is 52.

The square root of 28298869 is about 5319.6681287464. The cubic root of 28298869 is about 304.7354832815.

The spelling of 28298869 in words is "twenty-eight million, two hundred ninety-eight thousand, eight hundred sixty-nine".