133678 has 8 divisors (see below), whose sum is σ = 203040. Its totient is φ = 66000.

The previous prime is 133673. The next prime is 133691. The reversal of 133678 is 876331.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a plaindrome in base 10 and base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133673) by changing a digit.

133678 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 3 ways as a sum of consecutive naturals, for example, 198 + ... + 553.

It is an arithmetic number, because the mean of its divisors is an integer number (25380).

2¹³³⁶⁷⁸ is an apocalyptic number.

133678 is a deficient number, since it is larger than the sum of its proper divisors (69362).

133678 is an equidigital number, since it uses as much as digits as its factorization.

133678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 842.

The product of its digits is 3024, while the sum is 28.

The square root of 133678 is about 365.6200213336. The cubic root of 133678 is about 51.1312778361.

The spelling of 133678 in words is "one hundred thirty-three thousand, six hundred seventy-eight".