68781380520 has 64 divisors (see below), whose sum is σ = 218482038720. Its totient is φ = 17262777344.

The previous prime is 68781380519. The next prime is 68781380539. The reversal of 68781380520 is 2508318786.

It is a self number, because there is not a number n which added to its sum of digits gives 68781380520.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16856142 + ... + 16860221.

It is an arithmetic number, because the mean of its divisors is an integer number (3413781855).

Almost surely, 2^68781380520 is an apocalyptic number.

68781380520 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

68781380520 is an abundant number, since it is smaller than the sum of its proper divisors (149700658200).

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

68781380520 is a wasteful number, since it uses less digits than its factorization.

68781380520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33716394 (or 33716390 counting only the distinct ones).

The product of its (nonzero) digits is 645120, while the sum is 48.

The spelling of 68781380520 in words is "sixty-eight billion, seven hundred eighty-one million, three hundred eighty thousand, five hundred twenty".