28589993 has 2 divisors, whose sum is σ = 28589994. Its totient is φ = 28589992.

The previous prime is 28589983. The next prime is 28590007. The reversal of 28589993 is 39998582.

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., 23785129 + 4804864 = 4877^2 + 2192^2 .

It is a cyclic number.

It is not a de Polignac number, because 28589993 - 2²⁰ = 27541417 is a prime.

It is not a weakly prime, because it can be changed into another prime (28589923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14294996 + 14294997.

It is an arithmetic number, because the mean of its divisors is an integer number (14294997).

Almost surely, 2^28589993 is an apocalyptic number.

It is an amenable number.

28589993 is a deficient number, since it is larger than the sum of its proper divisors (1).

28589993 is an equidigital number, since it uses as much as digits as its factorization.

28589993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1399680, while the sum is 53.

The square root of 28589993 is about 5346.9610995406. The cubic root of 28589993 is about 305.7769067513.

The spelling of 28589993 in words is "twenty-eight million, five hundred eighty-nine thousand, nine hundred ninety-three".