28249489 has 2 divisors, whose sum is σ = 28249490. Its totient is φ = 28249488.

The previous prime is 28249483. The next prime is 28249517. The reversal of 28249489 is 98494282.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18421264 + 9828225 = 4292^2 + 3135^2 .

It is a cyclic number.

It is not a de Polignac number, because 28249489 - 2⁹ = 28248977 is a prime.

It is a super-2 number, since 2×28249489² = 1596067257522242, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28249483) 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, 14124744 + 14124745.

It is an arithmetic number, because the mean of its divisors is an integer number (14124745).

Almost surely, 2^28249489 is an apocalyptic number.

It is an amenable number.

28249489 is a deficient number, since it is larger than the sum of its proper divisors (1).

28249489 is an equidigital number, since it uses as much as digits as its factorization.

28249489 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 331776, while the sum is 46.

The square root of 28249489 is about 5315.0248353136. The cubic root of 28249489 is about 304.5581310910.

The spelling of 28249489 in words is "twenty-eight million, two hundred forty-nine thousand, four hundred eighty-nine".