28644459 has 8 divisors (see below), whose sum is σ = 38217360. Its totient is φ = 19083936.

The previous prime is 28644377. The next prime is 28644467. The reversal of 28644459 is 95444682.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28644459 - 2⁷ = 28644331 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 28644459.

It is not an unprimeable number, because it can be changed into a prime (28644359) 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 7 ways as a sum of consecutive naturals, for example, 7257 + ... + 10485.

It is an arithmetic number, because the mean of its divisors is an integer number (4777170).

Almost surely, 2^28644459 is an apocalyptic number.

28644459 is a deficient number, since it is larger than the sum of its proper divisors (9572901).

28644459 is a wasteful number, since it uses less digits than its factorization.

28644459 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6189.

The product of its digits is 276480, while the sum is 42.

The square root of 28644459 is about 5352.0518495246. The cubic root of 28644459 is about 305.9709592671.

The spelling of 28644459 in words is "twenty-eight million, six hundred forty-four thousand, four hundred fifty-nine".