67889561729 has 8 divisors (see below), whose sum is σ = 75867714720. Its totient is φ = 60212471200.

The previous prime is 67889561723. The next prime is 67889561743. The reversal of 67889561729 is 92716598876.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 67889561729 - 2²⁸ = 67621126273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (67889561723) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 75265139 + ... + 75266040.

It is an arithmetic number, because the mean of its divisors is an integer number (9483464340).

Almost surely, 2^67889561729 is an apocalyptic number.

It is an amenable number.

67889561729 is a deficient number, since it is larger than the sum of its proper divisors (7978152991).

67889561729 is a wasteful number, since it uses less digits than its factorization.

67889561729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150531231.

The product of its digits is 91445760, while the sum is 68.

The spelling of 67889561729 in words is "sixty-seven billion, eight hundred eighty-nine million, five hundred sixty-one thousand, seven hundred twenty-nine".