28188442140 has 24 divisors (see below), whose sum is σ = 78927638160. Its totient is φ = 7516917888.

The previous prime is 28188442111. The next prime is 28188442159. The reversal of 28188442140 is 4124488182.

It is a junction number, because it is equal to n+sod(n) for n = 28188442092 and 28188442101.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 234903625 + ... + 234903744.

It is an arithmetic number, because the mean of its divisors is an integer number (3288651590).

Almost surely, 2^28188442140 is an apocalyptic number.

28188442140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28188442140 is an abundant number, since it is smaller than the sum of its proper divisors (50739196020).

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

28188442140 is a wasteful number, since it uses less digits than its factorization.

28188442140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 469807381 (or 469807379 counting only the distinct ones).

The product of its (nonzero) digits is 131072, while the sum is 42.

The spelling of 28188442140 in words is "twenty-eight billion, one hundred eighty-eight million, four hundred forty-two thousand, one hundred forty".