678849 has 4 divisors (see below), whose sum is σ = 905136. Its totient is φ = 452564.

The previous prime is 678833. The next prime is 678859. The reversal of 678849 is 948876.

It is a happy number.

678849 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 678849 - 2⁴ = 678833 is a prime.

It is a D-number.

It is a self number, because there is not a number n which added to its sum of digits gives 678849.

It is not an unprimeable number, because it can be changed into a prime (678809) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 113139 + ... + 113144.

It is an arithmetic number, because the mean of its divisors is an integer number (226284).

2⁶⁷⁸⁸⁴⁹ is an apocalyptic number.

It is an amenable number.

678849 is a deficient number, since it is larger than the sum of its proper divisors (226287).

678849 is a wasteful number, since it uses less digits than its factorization.

678849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226286.

The product of its digits is 96768, while the sum is 42.

The square root of 678849 is about 823.9229332893. The cubic root of 678849 is about 87.8869502177.

The spelling of 678849 in words is "six hundred seventy-eight thousand, eight hundred forty-nine".