28581589 has 2 divisors, whose sum is σ = 28581590. Its totient is φ = 28581588.

The previous prime is 28581587. The next prime is 28581599. The reversal of 28581589 is 98518582.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26780625 + 1800964 = 5175^2 + 1342^2 .

It is a cyclic number.

It is not a de Polignac number, because 28581589 - 2¹ = 28581587 is a prime.

Together with 28581587, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28581587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14290794 + 14290795.

It is an arithmetic number, because the mean of its divisors is an integer number (14290795).

Almost surely, 2^28581589 is an apocalyptic number.

It is an amenable number.

28581589 is a deficient number, since it is larger than the sum of its proper divisors (1).

28581589 is an equidigital number, since it uses as much as digits as its factorization.

28581589 is an evil number, because the sum of its binary digits is even.

The product of its digits is 230400, while the sum is 46.

The square root of 28581589 is about 5346.1751748329. The cubic root of 28581589 is about 305.7469428760.

The spelling of 28581589 in words is "twenty-eight million, five hundred eighty-one thousand, five hundred eighty-nine".