28765291300 has 72 divisors (see below), whose sum is σ = 66287944800. Its totient is φ = 10803985920.

The previous prime is 28765291283. The next prime is 28765291301. The reversal of 28765291300 is 319256782.

It is not an unprimeable number, because it can be changed into a prime (28765291301) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 147711 + ... + 281689.

It is an arithmetic number, because the mean of its divisors is an integer number (920665900).

Almost surely, 2^28765291300 is an apocalyptic number.

28765291300 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 28765291300, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33143972400).

28765291300 is an abundant number, since it is smaller than the sum of its proper divisors (37522653500).

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

28765291300 is a wasteful number, since it uses less digits than its factorization.

28765291300 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134125 (or 134118 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 43.

The spelling of 28765291300 in words is "twenty-eight billion, seven hundred sixty-five million, two hundred ninety-one thousand, three hundred".