678860 has 48 divisors (see below), whose sum is σ = 1759296. Its totient is φ = 214272.

The previous prime is 678859. The next prime is 678871. The reversal of 678860 is 68876.

678860 = T₉₁ + T₉₂ + ... + T₁₆₈.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a self number, because there is not a number n which added to its sum of digits gives 678860.

It is an unprimeable 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 15 ways as a sum of consecutive naturals, for example, 1634 + ... + 2006.

It is an arithmetic number, because the mean of its divisors is an integer number (36652).

2⁶⁷⁸⁸⁶⁰ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 678860, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (879648).

678860 is an abundant number, since it is smaller than the sum of its proper divisors (1080436).

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

678860 is a wasteful number, since it uses less digits than its factorization.

678860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 402 (or 400 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 678860 is about 823.9296086438. The cubic root of 678860 is about 87.8874249189.

The spelling of 678860 in words is "six hundred seventy-eight thousand, eight hundred sixty".