28317444 has 48 divisors (see below), whose sum is σ = 70576128. Its totient is φ = 8805888.

The previous prime is 28317413. The next prime is 28317491. The reversal of 28317444 is 44471382.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25362 + ... + 26454.

It is an arithmetic number, because the mean of its divisors is an integer number (1470336).

Almost surely, 2^28317444 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28317444, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35288064).

28317444 is an abundant number, since it is smaller than the sum of its proper divisors (42258684).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28317444 is a wasteful number, since it uses less digits than its factorization.

28317444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1244 (or 1242 counting only the distinct ones).

The product of its digits is 21504, while the sum is 33.

The square root of 28317444 is about 5321.4137219352. The cubic root of 28317444 is about 304.8021434670.

The spelling of 28317444 in words is "twenty-eight million, three hundred seventeen thousand, four hundred forty-four".