68317728 has 48 divisors (see below), whose sum is σ = 187137216. Its totient is φ = 21781760.

The previous prime is 68317723. The next prime is 68317741. The reversal of 68317728 is 82771386.

It is a tau number, because it is divible by the number of its divisors (48).

It is a zygodrome in base 13.

It is a self number, because there is not a number n which added to its sum of digits gives 68317728.

It is not an unprimeable number, because it can be changed into a prime (68317723) 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, 13263 + ... + 17678.

It is an arithmetic number, because the mean of its divisors is an integer number (3898692).

Almost surely, 2^68317728 is an apocalyptic number.

It is an amenable number.

68317728 is an abundant number, since it is smaller than the sum of its proper divisors (118819488).

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

68317728 is a wasteful number, since it uses less digits than its factorization.

68317728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30977 (or 30969 counting only the distinct ones).

The product of its digits is 112896, while the sum is 42.

The square root of 68317728 is about 8265.4538895332. The cubic root of 68317728 is about 408.8002364164.

The spelling of 68317728 in words is "sixty-eight million, three hundred seventeen thousand, seven hundred twenty-eight".