28052500 has 90 divisors (see below), whose sum is σ = 71672370. Its totient is φ = 9576000.

The previous prime is 28052477. The next prime is 28052503. The reversal of 28052500 is 525082.

It can be written as a sum of positive squares in 5 ways, for example, as 4588164 + 23464336 = 2142^2 + 4844^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28052503) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 122386 + ... + 122614.

Almost surely, 2^28052500 is an apocalyptic number.

28052500 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 28052500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35836185).

28052500 is an abundant number, since it is smaller than the sum of its proper divisors (43619870).

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

28052500 is a wasteful number, since it uses less digits than its factorization.

28052500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 267 (or 243 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 22.

The square root of 28052500 is about 5296.4610826475. The cubic root of 28052500 is about 303.8485655050.

Adding to 28052500 its reverse (525082), we get a palindrome (28577582).

The spelling of 28052500 in words is "twenty-eight million, fifty-two thousand, five hundred".