28045500 has 96 divisors (see below), whose sum is σ = 93370368. Its totient is φ = 6408000.

The previous prime is 28045499. The next prime is 28045547. The reversal of 28045500 is 554082.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9165 + ... + 11835.

It is an arithmetic number, because the mean of its divisors is an integer number (972608).

Almost surely, 2^28045500 is an apocalyptic number.

28045500 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 28045500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46685184).

28045500 is an abundant number, since it is smaller than the sum of its proper divisors (65324868).

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

28045500 is a wasteful number, since it uses less digits than its factorization.

28045500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2700 (or 2688 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 24.

The square root of 28045500 is about 5295.8002228181. The cubic root of 28045500 is about 303.8232900762.

Adding to 28045500 its reverse (554082), we get a palindrome (28599582).

The spelling of 28045500 in words is "twenty-eight million, forty-five thousand, five hundred".