28432489 has 2 divisors, whose sum is σ = 28432490. Its totient is φ = 28432488.

The previous prime is 28432477. The next prime is 28432501. The reversal of 28432489 is 98423482.

It is a balanced prime because it is at equal distance from previous prime (28432477) and next prime (28432501).

It can be written as a sum of positive squares in only one way, i.e., 27931225 + 501264 = 5285^2 + 708^2 .

It is a cyclic number.

It is not a de Polignac number, because 28432489 - 2¹⁹ = 27908201 is a prime.

It is not a weakly prime, because it can be changed into another prime (28432289) 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, 14216244 + 14216245.

It is an arithmetic number, because the mean of its divisors is an integer number (14216245).

Almost surely, 2^28432489 is an apocalyptic number.

It is an amenable number.

28432489 is a deficient number, since it is larger than the sum of its proper divisors (1).

28432489 is an equidigital number, since it uses as much as digits as its factorization.

28432489 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 110592, while the sum is 40.

The square root of 28432489 is about 5332.2123926190. The cubic root of 28432489 is about 305.2143579558.

The spelling of 28432489 in words is "twenty-eight million, four hundred thirty-two thousand, four hundred eighty-nine".