678911 has 4 divisors (see below), whose sum is σ = 689112. Its totient is φ = 668712.

The previous prime is 678907. The next prime is 678941. The reversal of 678911 is 119876.

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 678911 - 2² = 678907 is a prime.

It is a Duffinian number.

It is a plaindrome in base 8.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (678901) 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, 5000 + ... + 5133.

It is an arithmetic number, because the mean of its divisors is an integer number (172278).

2⁶⁷⁸⁹¹¹ is an apocalyptic number.

678911 is a deficient number, since it is larger than the sum of its proper divisors (10201).

678911 is a wasteful number, since it uses less digits than its factorization.

678911 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10200.

The product of its digits is 3024, while the sum is 32.

The square root of 678911 is about 823.9605573084. The cubic root of 678911 is about 87.8896257391.

The spelling of 678911 in words is "six hundred seventy-eight thousand, nine hundred eleven".