68591967720 has 128 divisors (see below), whose sum is σ = 217354199040. Its totient is φ = 17289457920.

The previous prime is 68591967709. The next prime is 68591967757. The reversal of 68591967720 is 2776919586.

It is a Harshad number since it is a multiple of its sum of digits (60).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 54444 + ... + 374363.

It is an arithmetic number, because the mean of its divisors is an integer number (1698079680).

Almost surely, 2^68591967720 is an apocalyptic number.

68591967720 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 68591967720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (108677099520).

68591967720 is an abundant number, since it is smaller than the sum of its proper divisors (148762231320).

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

68591967720 is a wasteful number, since it uses less digits than its factorization.

68591967720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 428895 (or 428891 counting only the distinct ones).

The product of its (nonzero) digits is 11430720, while the sum is 60.

The spelling of 68591967720 in words is "sixty-eight billion, five hundred ninety-one million, nine hundred sixty-seven thousand, seven hundred twenty".