28558489 has 4 divisors (see below), whose sum is σ = 28620900. Its totient is φ = 28496080.

The previous prime is 28558477. The next prime is 28558507. The reversal of 28558489 is 98485582.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 13286025 + 15272464 = 3645^2 + 3908^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28558489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28558289) 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 in 3 ways as a sum of consecutive naturals, for example, 30514 + ... + 31435.

It is an arithmetic number, because the mean of its divisors is an integer number (7155225).

Almost surely, 2^28558489 is an apocalyptic number.

It is an amenable number.

28558489 is a deficient number, since it is larger than the sum of its proper divisors (62411).

28558489 is an equidigital number, since it uses as much as digits as its factorization.

28558489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62410.

The product of its digits is 921600, while the sum is 49.

The square root of 28558489 is about 5344.0143151006. The cubic root of 28558489 is about 305.6645511660.

The spelling of 28558489 in words is "twenty-eight million, five hundred fifty-eight thousand, four hundred eighty-nine".