28138170750 has 128 divisors (see below), whose sum is σ = 73379779200. Its totient is φ = 7172480000.

The previous prime is 28138170713. The next prime is 28138170751. The reversal of 28138170750 is 5707183182.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28138170751) 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 63 ways as a sum of consecutive naturals, for example, 2190346 + ... + 2203154.

It is an arithmetic number, because the mean of its divisors is an integer number (573279525).

Almost surely, 2^28138170750 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28138170750, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36689889600).

28138170750 is an abundant number, since it is smaller than the sum of its proper divisors (45241608450).

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

28138170750 is a wasteful number, since it uses less digits than its factorization.

28138170750 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12959 (or 12949 counting only the distinct ones).

The product of its (nonzero) digits is 94080, while the sum is 42.

The spelling of 28138170750 in words is "twenty-eight billion, one hundred thirty-eight million, one hundred seventy thousand, seven hundred fifty".