678206 has 4 divisors (see below), whose sum is σ = 1017312. Its totient is φ = 339102.

The previous prime is 678203. The next prime is 678211. The reversal of 678206 is 602876.

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

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (678203) by changing a digit.

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 as a sum of consecutive naturals, namely, 169550 + ... + 169553.

It is an arithmetic number, because the mean of its divisors is an integer number (254328).

2⁶⁷⁸²⁰⁶ is an apocalyptic number.

678206 is a deficient number, since it is larger than the sum of its proper divisors (339106).

678206 is a wasteful number, since it uses less digits than its factorization.

678206 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 339105.

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 678206 is about 823.5326344475. The cubic root of 678206 is about 87.8591928614.

The spelling of 678206 in words is "six hundred seventy-eight thousand, two hundred six".