28743289 has 2 divisors, whose sum is σ = 28743290. Its totient is φ = 28743288.

The previous prime is 28743269. The next prime is 28743313. The reversal of 28743289 is 98234782.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28729600 + 13689 = 5360^2 + 117^2 .

It is a cyclic number.

It is not a de Polignac number, because 28743289 - 2¹⁷ = 28612217 is a prime.

It is not a weakly prime, because it can be changed into another prime (28743229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14371644 + 14371645.

It is an arithmetic number, because the mean of its divisors is an integer number (14371645).

Almost surely, 2^28743289 is an apocalyptic number.

It is an amenable number.

28743289 is a deficient number, since it is larger than the sum of its proper divisors (1).

28743289 is an equidigital number, since it uses as much as digits as its factorization.

28743289 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 193536, while the sum is 43.

The square root of 28743289 is about 5361.2768068810. The cubic root of 28743289 is about 306.3224455017.

The spelling of 28743289 in words is "twenty-eight million, seven hundred forty-three thousand, two hundred eighty-nine".