28805300 has 18 divisors (see below), whose sum is σ = 62507718. Its totient is φ = 11522080.

The previous prime is 28805299. The next prime is 28805303. The reversal of 28805300 is 350882.

It can be written as a sum of positive squares in 3 ways, for example, as 524176 + 28281124 = 724^2 + 5318^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 28805300.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28805303) 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 5 ways as a sum of consecutive naturals, for example, 143927 + ... + 144126.

It is an arithmetic number, because the mean of its divisors is an integer number (3472651).

Almost surely, 2^28805300 is an apocalyptic number.

28805300 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28805300 is an abundant number, since it is smaller than the sum of its proper divisors (33702418).

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

28805300 is a wasteful number, since it uses less digits than its factorization.

28805300 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 288067 (or 288060 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 28805300 is about 5367.0569216285. The cubic root of 28805300 is about 306.5425747670.

The spelling of 28805300 in words is "twenty-eight million, eight hundred five thousand, three hundred".