28186443220 has 48 divisors (see below), whose sum is σ = 63803795328. Its totient is φ = 10397658240.

The previous prime is 28186443217. The next prime is 28186443227. The reversal of 28186443220 is 2234468182.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28186443227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 233977 + ... + 333343.

It is an arithmetic number, because the mean of its divisors is an integer number (1329245736).

Almost surely, 2^28186443220 is an apocalyptic number.

28186443220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28186443220 is an abundant number, since it is smaller than the sum of its proper divisors (35617352108).

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

28186443220 is a wasteful number, since it uses less digits than its factorization.

28186443220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100480 (or 100478 counting only the distinct ones).

The product of its (nonzero) digits is 147456, while the sum is 40.

The spelling of 28186443220 in words is "twenty-eight billion, one hundred eighty-six million, four hundred forty-three thousand, two hundred twenty".