28887889 has 2 divisors, whose sum is σ = 28887890. Its totient is φ = 28887888.

The previous prime is 28887871. The next prime is 28887907. The reversal of 28887889 is 98878882.

It is a balanced prime because it is at equal distance from previous prime (28887871) and next prime (28887907).

It can be written as a sum of positive squares in only one way, i.e., 19228225 + 9659664 = 4385^2 + 3108^2 .

It is a cyclic number.

It is not a de Polignac number, because 28887889 - 2²¹ = 26790737 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28887829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14443944 + 14443945.

It is an arithmetic number, because the mean of its divisors is an integer number (14443945).

Almost surely, 2^28887889 is an apocalyptic number.

It is an amenable number.

28887889 is a deficient number, since it is larger than the sum of its proper divisors (1).

28887889 is an equidigital number, since it uses as much as digits as its factorization.

28887889 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4128768, while the sum is 58.

The square root of 28887889 is about 5374.7454823461. The cubic root of 28887889 is about 306.8352626553.

The spelling of 28887889 in words is "twenty-eight million, eight hundred eighty-seven thousand, eight hundred eighty-nine".