68128710581988 has 216 divisors, whose sum is σ = 202045015920384. Its totient is φ = 19299282912000.

The previous prime is 68128710581977. The next prime is 68128710582013. The reversal of 68128710581988 is 88918501782186.

68128710581988 is a `hidden beast` number, since 6 + 8 + 1 + 28 + 7 + 10 + 581 + 9 + 8 + 8 = 666.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 138530181 + ... + 139021107.

It is an arithmetic number, because the mean of its divisors is an integer number (935393592224).

Almost surely, 2^{68128710581988} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 68128710581988, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (101022507960192).

68128710581988 is an abundant number, since it is smaller than the sum of its proper divisors (133916305338396).

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

68128710581988 is a wasteful number, since it uses less digits than its factorization.

68128710581988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 491623 (or 491611 counting only the distinct ones).

The product of its (nonzero) digits is 123863040, while the sum is 72.

The spelling of 68128710581988 in words is "sixty-eight trillion, one hundred twenty-eight billion, seven hundred ten million, five hundred eighty-one thousand, nine hundred eighty-eight".