678355 has 4 divisors (see below), whose sum is σ = 814032. Its totient is φ = 542680.

The previous prime is 678343. The next prime is 678367. The reversal of 678355 is 553876.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (678343) and next prime (678367).

It is not a de Polignac number, because 678355 - 2¹⁹ = 154067 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 678355.

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, 67831 + ... + 67840.

It is an arithmetic number, because the mean of its divisors is an integer number (203508).

2⁶⁷⁸³⁵⁵ is an apocalyptic number.

678355 is a deficient number, since it is larger than the sum of its proper divisors (135677).

678355 is a wasteful number, since it uses less digits than its factorization.

678355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135676.

The product of its digits is 25200, while the sum is 34.

The square root of 678355 is about 823.6230934111. The cubic root of 678355 is about 87.8656265316.

The spelling of 678355 in words is "six hundred seventy-eight thousand, three hundred fifty-five".