28186922500 has 120 divisors (see below), whose sum is σ = 67386854304. Its totient is φ = 10227840000.

The previous prime is 28186922483. The next prime is 28186922509. The reversal of 28186922500 is 522968182.

It is not an unprimeable number, because it can be changed into a prime (28186922509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 18506739 + ... + 18508261.

Almost surely, 2^28186922500 is an apocalyptic number.

28186922500 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 28186922500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33693427152).

28186922500 is an abundant number, since it is smaller than the sum of its proper divisors (39199931804).

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

28186922500 is a wasteful number, since it uses less digits than its factorization.

28186922500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2231 (or 2214 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 43.

The spelling of 28186922500 in words is "twenty-eight billion, one hundred eighty-six million, nine hundred twenty-two thousand, five hundred".