28133188220 has 48 divisors (see below), whose sum is σ = 59926889568. Its totient is φ = 11092101120.

The previous prime is 28133188219. The next prime is 28133188249. The reversal of 28133188220 is 2288133182.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 2720660 + ... + 2730980.

It is an arithmetic number, because the mean of its divisors is an integer number (1248476866).

Almost surely, 2^28133188220 is an apocalyptic number.

28133188220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28133188220 is an abundant number, since it is smaller than the sum of its proper divisors (31793701348).

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

28133188220 is a wasteful number, since it uses less digits than its factorization.

28133188220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12270 (or 12268 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 38.

The spelling of 28133188220 in words is "twenty-eight billion, one hundred thirty-three million, one hundred eighty-eight thousand, two hundred twenty".