68787931968 has 840 divisors, whose sum is σ = 252928526400. Its totient is φ = 18098049024.

The previous prime is 68787931931. The next prime is 68787931969. The reversal of 68787931968 is 86913978786.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 68787931896 and 68787931905.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68787931969) by changing a digit.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 772898068 + ... + 772898156.

Almost surely, 2^68787931968 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 68787931968, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (126464263200).

68787931968 is an abundant number, since it is smaller than the sum of its proper divisors (184140594432).

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

68787931968 is a wasteful number, since it uses less digits than its factorization.

68787931968 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217 (or 179 counting only the distinct ones).

The product of its digits is 219469824, while the sum is 72.

The spelling of 68787931968 in words is "sixty-eight billion, seven hundred eighty-seven million, nine hundred thirty-one thousand, nine hundred sixty-eight".