28544459 has 4 divisors (see below), whose sum is σ = 29465280. Its totient is φ = 27623640.

The previous prime is 28544443. The next prime is 28544471. The reversal of 28544459 is 95444582.

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

It is a cyclic number.

It is not a de Polignac number, because 28544459 - 2⁴ = 28544443 is a prime.

It is a super-2 number, since 2×28544459² = 1629572279205362, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28544419) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 460364 + ... + 460425.

It is an arithmetic number, because the mean of its divisors is an integer number (7366320).

Almost surely, 2^28544459 is an apocalyptic number.

28544459 is a deficient number, since it is larger than the sum of its proper divisors (920821).

28544459 is an equidigital number, since it uses as much as digits as its factorization.

28544459 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 920820.

The product of its digits is 230400, while the sum is 41.

The square root of 28544459 is about 5342.7014702302. The cubic root of 28544459 is about 305.6144881052.

It can be divided in two parts, 285 and 44459, that added together give a palindrome (44744).

The spelling of 28544459 in words is "twenty-eight million, five hundred forty-four thousand, four hundred fifty-nine".