28138033500 has 192 divisors, whose sum is σ = 86649937920. Its totient is φ = 7083840000.

The previous prime is 28138033403. The next prime is 28138033507. The reversal of 28138033500 is 533083182.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28138033507) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1899121 + ... + 1913879.

It is an arithmetic number, because the mean of its divisors is an integer number (451301760).

Almost surely, 2^28138033500 is an apocalyptic number.

28138033500 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 28138033500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43324968960).

28138033500 is an abundant number, since it is smaller than the sum of its proper divisors (58511904420).

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

28138033500 is a wasteful number, since it uses less digits than its factorization.

28138033500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14853 (or 14841 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 33.

The spelling of 28138033500 in words is "twenty-eight billion, one hundred thirty-eight million, thirty-three thousand, five hundred".