68539660728 has 128 divisors (see below), whose sum is σ = 214195968000. Its totient is φ = 17755355520.

The previous prime is 68539660723. The next prime is 68539660729. The reversal of 68539660728 is 82706693586.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68539660723) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 651463 + ... + 749321.

It is an arithmetic number, because the mean of its divisors is an integer number (1673406000).

Almost surely, 2^68539660728 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 68539660728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (107097984000).

68539660728 is an abundant number, since it is smaller than the sum of its proper divisors (145656307272).

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

68539660728 is a wasteful number, since it uses less digits than its factorization.

68539660728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98265 (or 98261 counting only the distinct ones).

The product of its (nonzero) digits is 26127360, while the sum is 60.

The spelling of 68539660728 in words is "sixty-eight billion, five hundred thirty-nine million, six hundred sixty thousand, seven hundred twenty-eight".