68128710581990 has 8 divisors (see below), whose sum is σ = 122631679047600. Its totient is φ = 27251484232792.

The previous prime is 68128710581977. The next prime is 68128710582013. The reversal of 68128710581990 is 9918501782186.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3406435529090 + ... + 3406435529109.

It is an arithmetic number, because the mean of its divisors is an integer number (15328959880950).

Almost surely, 2^{68128710581990} is an apocalyptic number.

68128710581990 is a deficient number, since it is larger than the sum of its proper divisors (54502968465610).

68128710581990 is a wasteful number, since it uses less digits than its factorization.

68128710581990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6812871058206.

The product of its (nonzero) digits is 17418240, while the sum is 65.

The spelling of 68128710581990 in words is "sixty-eight trillion, one hundred twenty-eight billion, seven hundred ten million, five hundred eighty-one thousand, nine hundred ninety".