28849789 has 2 divisors, whose sum is σ = 28849790. Its totient is φ = 28849788.

The previous prime is 28849787. The next prime is 28849801. The reversal of 28849789 is 98794882.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28783225 + 66564 = 5365^2 + 258^2 .

It is a cyclic number.

It is not a de Polignac number, because 28849789 - 2¹ = 28849787 is a prime.

Together with 28849787, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28849783) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14424894 + 14424895.

It is an arithmetic number, because the mean of its divisors is an integer number (14424895).

Almost surely, 2^28849789 is an apocalyptic number.

It is an amenable number.

28849789 is a deficient number, since it is larger than the sum of its proper divisors (1).

28849789 is an equidigital number, since it uses as much as digits as its factorization.

28849789 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2322432, while the sum is 55.

The square root of 28849789 is about 5371.1999590408. The cubic root of 28849789 is about 306.7003091373.

The spelling of 28849789 in words is "twenty-eight million, eight hundred forty-nine thousand, seven hundred eighty-nine".