28448989 has 2 divisors, whose sum is σ = 28448990. Its totient is φ = 28448988.

The previous prime is 28448977. The next prime is 28449011. The reversal of 28448989 is 98984482.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28440889 + 8100 = 5333^2 + 90^2 .

It is a cyclic number.

It is not a de Polignac number, because 28448989 - 2⁹ = 28448477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28448689) 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, 14224494 + 14224495.

It is an arithmetic number, because the mean of its divisors is an integer number (14224495).

Almost surely, 2^28448989 is an apocalyptic number.

It is an amenable number.

28448989 is a deficient number, since it is larger than the sum of its proper divisors (1).

28448989 is an equidigital number, since it uses as much as digits as its factorization.

28448989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1327104, while the sum is 52.

The square root of 28448989 is about 5333.7593684005. The cubic root of 28448989 is about 305.2733874114.

The spelling of 28448989 in words is "twenty-eight million, four hundred forty-eight thousand, nine hundred eighty-nine".