68931968 has 64 divisors (see below), whose sum is σ = 158630400. Its totient is φ = 29225472.

The previous prime is 68931931. The next prime is 68931971. The reversal of 68931968 is 86913986.

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

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, 95513 + ... + 96231.

It is an arithmetic number, because the mean of its divisors is an integer number (2478600).

Almost surely, 2^68931968 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 68931968, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (79315200).

68931968 is an abundant number, since it is smaller than the sum of its proper divisors (89698432).

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

68931968 is a wasteful number, since it uses less digits than its factorization.

68931968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 847 (or 835 counting only the distinct ones).

The product of its digits is 559872, while the sum is 50.

The square root of 68931968 is about 8302.5278078426. The cubic root of 68931968 is about 410.0217478054.

The spelling of 68931968 in words is "sixty-eight million, nine hundred thirty-one thousand, nine hundred sixty-eight".