678558 has 8 divisors (see below), whose sum is σ = 1357128. Its totient is φ = 226184.

The previous prime is 678553. The next prime is 678563. The reversal of 678558 is 855876.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (678553) and next prime (678563).

It is a sphenic number, since it is the product of 3 distinct primes.

678558 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (678553) by changing a digit.

678558 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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, 56541 + ... + 56552.

It is an arithmetic number, because the mean of its divisors is an integer number (169641).

2⁶⁷⁸⁵⁵⁸ is an apocalyptic number.

678558 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

678558 is a wasteful number, since it uses less digits than its factorization.

678558 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113098.

The product of its digits is 67200, while the sum is 39.

The square root of 678558 is about 823.7463201739. The cubic root of 678558 is about 87.8743903515.

The spelling of 678558 in words is "six hundred seventy-eight thousand, five hundred fifty-eight".