28857889 has 2 divisors, whose sum is σ = 28857890. Its totient is φ = 28857888.

The previous prime is 28857883. The next prime is 28857911. The reversal of 28857889 is 98875882.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14569489 + 14288400 = 3817^2 + 3780^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28857889 is a prime.

It is not a weakly prime, because it can be changed into another prime (28857883) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14428944 + 14428945.

It is an arithmetic number, because the mean of its divisors is an integer number (14428945).

Almost surely, 2^28857889 is an apocalyptic number.

It is an amenable number.

28857889 is a deficient number, since it is larger than the sum of its proper divisors (1).

28857889 is an equidigital number, since it uses as much as digits as its factorization.

28857889 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2580480, while the sum is 55.

The square root of 28857889 is about 5371.9539275761. The cubic root of 28857889 is about 306.7290099832.

The spelling of 28857889 in words is "twenty-eight million, eight hundred fifty-seven thousand, eight hundred eighty-nine".