28805000 has 80 divisors (see below), whose sum is σ = 77225280. Its totient is φ = 9864000.

The previous prime is 28804999. The next prime is 28805003. The reversal of 28805000 is 50882.

It is not an unprimeable number, because it can be changed into a prime (28805003) 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 19 ways as a sum of consecutive naturals, for example, 34589 + ... + 35411.

It is an arithmetic number, because the mean of its divisors is an integer number (965316).

Almost surely, 2^28805000 is an apocalyptic number.

28805000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28805000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38612640).

28805000 is an abundant number, since it is smaller than the sum of its proper divisors (48420280).

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

28805000 is an equidigital number, since it uses as much as digits as its factorization.

28805000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 856 (or 837 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 23.

The square root of 28805000 is about 5367.0289732775. The cubic root of 28805000 is about 306.5415105752.

Adding to 28805000 its reverse (50882), we get a palindrome (28855882).

The spelling of 28805000 in words is "twenty-eight million, eight hundred five thousand".