28000550500 has 96 divisors (see below), whose sum is σ = 66039573600. Its totient is φ = 10310054400.

The previous prime is 28000550491. The next prime is 28000550507. The reversal of 28000550500 is 505500082.

It can be written as a sum of positive squares in 16 ways, for example, as 16419347044 + 11581203456 = 128138^2 + 107616^2 .

It is a Harshad number since it is a multiple of its sum of digits (25).

It is not an unprimeable number, because it can be changed into a prime (28000550507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2418726 + ... + 2430274.

It is an arithmetic number, because the mean of its divisors is an integer number (687912225).

Almost surely, 2^28000550500 is an apocalyptic number.

28000550500 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 28000550500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33019786800).

28000550500 is an abundant number, since it is smaller than the sum of its proper divisors (38039023100).

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

28000550500 is a wasteful number, since it uses less digits than its factorization.

28000550500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11954 (or 11942 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 25.

The spelling of 28000550500 in words is "twenty-eight billion, five hundred fifty thousand, five hundred".