28217484 has 120 divisors (see below), whose sum is σ = 80498880. Its totient is φ = 8584704.

The previous prime is 28217477. The next prime is 28217507. The reversal of 28217484 is 48471282.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 258822 + ... + 258930.

It is an arithmetic number, because the mean of its divisors is an integer number (670824).

Almost surely, 2^28217484 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 28217484, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40249440).

28217484 is an abundant number, since it is smaller than the sum of its proper divisors (52281396).

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

28217484 is a wasteful number, since it uses less digits than its factorization.

28217484 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189 (or 178 counting only the distinct ones).

The product of its digits is 28672, while the sum is 36.

The square root of 28217484 is about 5312.0131776945. The cubic root of 28217484 is about 304.4430721794.

It can be divided in two parts, 282 and 17484, that added together give a triangular number (17766 = T₁₈₈).

The spelling of 28217484 in words is "twenty-eight million, two hundred seventeen thousand, four hundred eighty-four".