67619781768 has 128 divisors (see below), whose sum is σ = 210833694720. Its totient is φ = 17557685760.

The previous prime is 67619781751. The next prime is 67619781809. The reversal of 67619781768 is 86718791676.

It is a Harshad number since it is a multiple of its sum of digits (66).

It is a junction number, because it is equal to n+sod(n) for n = 67619781699 and 67619781708.

It is an unprimeable number.

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, 9397180 + ... + 9404372.

It is an arithmetic number, because the mean of its divisors is an integer number (1647138240).

Almost surely, 2^67619781768 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 67619781768, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (105416847360).

67619781768 is an abundant number, since it is smaller than the sum of its proper divisors (143213912952).

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

67619781768 is a wasteful number, since it uses less digits than its factorization.

67619781768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12307 (or 12303 counting only the distinct ones).

The product of its digits is 42674688, while the sum is 66.

The spelling of 67619781768 in words is "sixty-seven billion, six hundred nineteen million, seven hundred eighty-one thousand, seven hundred sixty-eight".