68705617830 has 64 divisors (see below), whose sum is σ = 169426745280. Its totient is φ = 17818251264.

The previous prime is 68705617829. The next prime is 68705617837. The reversal of 68705617830 is 3871650786.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68705617837) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2670066 + ... + 2695674.

It is an arithmetic number, because the mean of its divisors is an integer number (2647292895).

Almost surely, 2^68705617830 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 68705617830, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (84713372640).

68705617830 is an abundant number, since it is smaller than the sum of its proper divisors (100721127450).

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

68705617830 is a wasteful number, since it uses less digits than its factorization.

68705617830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28073.

The product of its (nonzero) digits is 1693440, while the sum is 51.

The spelling of 68705617830 in words is "sixty-eight billion, seven hundred five million, six hundred seventeen thousand, eight hundred thirty".