28444958321880 has 256 divisors, whose sum is σ = 86342854348800. Its totient is φ = 7496333360640.

The previous prime is 28444958321867. The next prime is 28444958321911. The reversal of 28444958321880 is 8812385944482.

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, 4080466795 + ... + 4080473765.

It is an arithmetic number, because the mean of its divisors is an integer number (337276774800).

Almost surely, 2^{28444958321880} is an apocalyptic number.

28444958321880 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 28444958321880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43171427174400).

28444958321880 is an abundant number, since it is smaller than the sum of its proper divisors (57897896026920).

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

28444958321880 is a wasteful number, since it uses less digits than its factorization.

28444958321880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8294 (or 8290 counting only the distinct ones).

The product of its (nonzero) digits is 141557760, while the sum is 66.

The spelling of 28444958321880 in words is "twenty-eight trillion, four hundred forty-four billion, nine hundred fifty-eight million, three hundred twenty-one thousand, eight hundred eighty".