678671 has 4 divisors (see below), whose sum is σ = 775632. Its totient is φ = 581712.

The previous prime is 678659. The next prime is 678719. The reversal of 678671 is 176876.

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 678671 - 2⁶ = 678607 is a prime.

It is a Duffinian number.

It is a plaindrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (678611) 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 in 3 ways as a sum of consecutive naturals, for example, 48470 + ... + 48483.

It is an arithmetic number, because the mean of its divisors is an integer number (193908).

2⁶⁷⁸⁶⁷¹ is an apocalyptic number.

678671 is a deficient number, since it is larger than the sum of its proper divisors (96961).

678671 is an equidigital number, since it uses as much as digits as its factorization.

678671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96960.

The product of its digits is 14112, while the sum is 35.

The square root of 678671 is about 823.8149063958. The cubic root of 678671 is about 87.8792679768.

The spelling of 678671 in words is "six hundred seventy-eight thousand, six hundred seventy-one".