68381680 has 20 divisors (see below), whose sum is σ = 158987592. Its totient is φ = 27352640.

The previous prime is 68381669. The next prime is 68381693. The reversal of 68381680 is 8618386.

It is a tau number, because it is divible by the number of its divisors (20).

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 427306 + ... + 427465.

Almost surely, 2^68381680 is an apocalyptic number.

It is an amenable number.

68381680 is an abundant number, since it is smaller than the sum of its proper divisors (90605912).

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

68381680 is a wasteful number, since it uses less digits than its factorization.

68381680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 854784 (or 854778 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 40.

The square root of 68381680 is about 8269.3216166745. The cubic root of 68381680 is about 408.9277554859.

The spelling of 68381680 in words is "sixty-eight million, three hundred eighty-one thousand, six hundred eighty".