678235 has 4 divisors (see below), whose sum is σ = 813888. Its totient is φ = 542584.

The previous prime is 678229. The next prime is 678253. The reversal of 678235 is 532876.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 678235 - 2⁵ = 678203 is a prime.

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 a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 678197 and 678206.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67819 + ... + 67828.

It is an arithmetic number, because the mean of its divisors is an integer number (203472).

2⁶⁷⁸²³⁵ is an apocalyptic number.

678235 is a deficient number, since it is larger than the sum of its proper divisors (135653).

678235 is a wasteful number, since it uses less digits than its factorization.

678235 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135652.

The product of its digits is 10080, while the sum is 31.

The square root of 678235 is about 823.5502413332. The cubic root of 678235 is about 87.8604451261.

It can be divided in two parts, 678 and 235, that multiplied together give a triangular number (159330 = T₅₆₄).

The spelling of 678235 in words is "six hundred seventy-eight thousand, two hundred thirty-five".