163678 has 4 divisors (see below), whose sum is σ = 245520. Its totient is φ = 81838.

The previous prime is 163673. The next prime is 163679. The reversal of 163678 is 876361.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 876361 = 461 ⋅1901.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163673) by changing a digit.

163678 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 (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40918 + ... + 40921.

It is an arithmetic number, because the mean of its divisors is an integer number (61380).

2¹⁶³⁶⁷⁸ is an apocalyptic number.

163678 is a deficient number, since it is larger than the sum of its proper divisors (81842).

163678 is an equidigital number, since it uses as much as digits as its factorization.

163678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81841.

The product of its digits is 6048, while the sum is 31.

The square root of 163678 is about 404.5713781275. The cubic root of 163678 is about 54.7011894437.

It can be divided in two parts, 163 and 678, that added together give a square (841 = 29²).

The spelling of 163678 in words is "one hundred sixty-three thousand, six hundred seventy-eight".