68520567808 has 88 divisors (see below), whose sum is σ = 170773251264. Its totient is φ = 26696294400.

The previous prime is 68520567779. The next prime is 68520567823. The reversal of 68520567808 is 80876502586.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (88).

It is a Smith number, since the sum of its digits (55) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 355663 + ... + 513358.

It is an arithmetic number, because the mean of its divisors is an integer number (1940605128).

Almost surely, 2^68520567808 is an apocalyptic number.

It is an amenable number.

68520567808 is an abundant number, since it is smaller than the sum of its proper divisors (102252683456).

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

68520567808 is a wasteful number, since it uses less digits than its factorization.

68520567808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 869059 (or 869041 counting only the distinct ones).

The product of its (nonzero) digits is 6451200, while the sum is 55.

The spelling of 68520567808 in words is "sixty-eight billion, five hundred twenty million, five hundred sixty-seven thousand, eight hundred eight".