68381856 has 72 divisors (see below), whose sum is σ = 195380640. Its totient is φ = 22686336.

The previous prime is 68381843. The next prime is 68381857. The reversal of 68381856 is 65818386.

It is a tau number, because it is divible by the number of its divisors (72).

It is not an unprimeable number, because it can be changed into a prime (68381857) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 81085 + ... + 81923.

It is an arithmetic number, because the mean of its divisors is an integer number (2713620).

Almost surely, 2^68381856 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 68381856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (97690320).

68381856 is an abundant number, since it is smaller than the sum of its proper divisors (126998784).

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

68381856 is a wasteful number, since it uses less digits than its factorization.

68381856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1138 (or 1127 counting only the distinct ones).

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

The square root of 68381856 is about 8269.3322584112. The cubic root of 68381856 is about 408.9281063169.

It can be divided in two parts, 68 and 381856, that added together give a square (381924 = 618²).

The spelling of 68381856 in words is "sixty-eight million, three hundred eighty-one thousand, eight hundred fifty-six".