678857 has 4 divisors (see below), whose sum is σ = 687120. Its totient is φ = 670596.

The previous prime is 678833. The next prime is 678859. The reversal of 678857 is 758876.

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 678857 - 2¹² = 674761 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (678859) 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, 4007 + ... + 4172.

It is an arithmetic number, because the mean of its divisors is an integer number (171780).

2⁶⁷⁸⁸⁵⁷ is an apocalyptic number.

It is an amenable number.

678857 is a deficient number, since it is larger than the sum of its proper divisors (8263).

678857 is an equidigital number, since it uses as much as digits as its factorization.

678857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8262.

The product of its digits is 94080, while the sum is 41.

The square root of 678857 is about 823.9277880980. The cubic root of 678857 is about 87.8872954554.

The spelling of 678857 in words is "six hundred seventy-eight thousand, eight hundred fifty-seven".