678559 has 16 divisors (see below), whose sum is σ = 829440. Its totient is φ = 542880.

The previous prime is 678553. The next prime is 678563. The reversal of 678559 is 955876.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 678559 - 2⁹ = 678047 is a prime.

It is a Duffinian number.

Its product of digits (75600) is a multiple of the sum of its prime divisors (150).

It is a congruent number.

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

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11472 + ... + 11530.

It is an arithmetic number, because the mean of its divisors is an integer number (51840).

2⁶⁷⁸⁵⁵⁹ is an apocalyptic number.

678559 is a deficient number, since it is larger than the sum of its proper divisors (150881).

678559 is a wasteful number, since it uses less digits than its factorization.

678559 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150.

The product of its digits is 75600, while the sum is 40.

The square root of 678559 is about 823.7469271566. The cubic root of 678559 is about 87.8744335187.

The spelling of 678559 in words is "six hundred seventy-eight thousand, five hundred fifty-nine".