678870 has 48 divisors (see below), whose sum is σ = 1862640. Its totient is φ = 171072.

The previous prime is 678859. The next prime is 678871. The reversal of 678870 is 78876.

It is a happy number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 678870.

It is not an unprimeable number, because it can be changed into a prime (678871) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1512 + ... + 1908.

It is an arithmetic number, because the mean of its divisors is an integer number (38805).

2⁶⁷⁸⁸⁷⁰ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 678870, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (931320).

678870 is an abundant number, since it is smaller than the sum of its proper divisors (1183770).

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

678870 is a wasteful number, since it uses less digits than its factorization.

678870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 429 (or 426 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 36.

The square root of 678870 is about 823.9356771011. The cubic root of 678870 is about 87.8878564609.

The spelling of 678870 in words is "six hundred seventy-eight thousand, eight hundred seventy".