28000500 has 96 divisors (see below), whose sum is σ = 89002368. Its totient is φ = 6784000.

The previous prime is 28000477. The next prime is 28000507. The reversal of 28000500 is 500082.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 28000500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28000507) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15652 + ... + 17348.

It is an arithmetic number, because the mean of its divisors is an integer number (927108).

Almost surely, 2^28000500 is an apocalyptic number.

28000500 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 28000500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44501184).

28000500 is an abundant number, since it is smaller than the sum of its proper divisors (61001868).

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

28000500 is a wasteful number, since it uses less digits than its factorization.

28000500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1730 (or 1718 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 15.

The square root of 28000500 is about 5291.5498674774. The cubic root of 28000500 is about 303.6607046702.

Adding to 28000500 its reverse (500082), we get a palindrome (28500582).

The spelling of 28000500 in words is "twenty-eight million, five hundred", and thus it is an aban number.