28173603644928 has 640 divisors, whose sum is σ = 97608381235200. Its totient is φ = 7856400605184.

The previous prime is 28173603644917. The next prime is 28173603645071. The reversal of 28173603644928 is 82944630637182.

28173603644928 is a `hidden beast` number, since 2 + 8 + 17 + 3 + 603 + 6 + 4 + 4 + 9 + 2 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1669142793 + ... + 1669159671.

It is an arithmetic number, because the mean of its divisors is an integer number (152513095680).

Almost surely, 2^{28173603644928} is an apocalyptic number.

28173603644928 is a gapful number since it is divisible by the number (28) 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 28173603644928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (48804190617600).

28173603644928 is an abundant number, since it is smaller than the sum of its proper divisors (69434777590272).

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

28173603644928 is a wasteful number, since it uses less digits than its factorization.

28173603644928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17327 (or 17305 counting only the distinct ones).

The product of its (nonzero) digits is 83607552, while the sum is 63.

The spelling of 28173603644928 in words is "twenty-eight trillion, one hundred seventy-three billion, six hundred three million, six hundred forty-four thousand, nine hundred twenty-eight".