68389968 has 160 divisors (see below), whose sum is σ = 199987200. Its totient is φ = 20044800.

The previous prime is 68389943. The next prime is 68390011. The reversal of 68389968 is 86998386.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1159123 + ... + 1159181.

It is an arithmetic number, because the mean of its divisors is an integer number (1249920).

Almost surely, 2^68389968 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 68389968, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (99993600).

68389968 is an abundant number, since it is smaller than the sum of its proper divisors (131597232).

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

68389968 is a wasteful number, since it uses less digits than its factorization.

68389968 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161 (or 155 counting only the distinct ones).

The product of its digits is 4478976, while the sum is 57.

The square root of 68389968 is about 8269.8227308691. The cubic root of 68389968 is about 408.9442757797.

The spelling of 68389968 in words is "sixty-eight million, three hundred eighty-nine thousand, nine hundred sixty-eight".