68159844 has 18 divisors (see below), whose sum is σ = 172293030. Its totient is φ = 22719936.

The previous prime is 68159843. The next prime is 68159873. The reversal of 68159844 is 44895186.

It can be written as a sum of positive squares in only one way, i.e., 68062500 + 97344 = 8250^2 + 312^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 68159844.

It is not an unprimeable number, because it can be changed into a prime (68159843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 946629 + ... + 946700.

It is an arithmetic number, because the mean of its divisors is an integer number (9571835).

Almost surely, 2^68159844 is an apocalyptic number.

It is an amenable number.

68159844 is an abundant number, since it is smaller than the sum of its proper divisors (104133186).

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

68159844 is a wasteful number, since it uses less digits than its factorization.

68159844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1893339 (or 1893334 counting only the distinct ones).

The product of its digits is 276480, while the sum is 45.

The square root of 68159844 is about 8255.8975284338. The cubic root of 68159844 is about 408.4850776110.

The spelling of 68159844 in words is "sixty-eight million, one hundred fifty-nine thousand, eight hundred forty-four".