67678 has 16 divisors (see below), whose sum is σ = 115920. Its totient is φ = 29376.

The previous prime is 67651. The next prime is 67679. The reversal of 67678 is 87676.

67678 is an esthetic number in base 10, because in such base its adjacent digits differ by 1.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67679) by changing a digit.

67678 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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 7 ways as a sum of consecutive naturals, for example, 426 + ... + 562.

It is an arithmetic number, because the mean of its divisors is an integer number (7245).

2⁶⁷⁶⁷⁸ is an apocalyptic number.

67678 is a deficient number, since it is larger than the sum of its proper divisors (48242).

67678 is a wasteful number, since it uses less digits than its factorization.

67678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171.

The product of its digits is 14112, while the sum is 34.

The square root of 67678 is about 260.1499567557. The cubic root of 67678 is about 40.7520229339.

The spelling of 67678 in words is "sixty-seven thousand, six hundred seventy-eight".