678878 has 16 divisors (see below), whose sum is σ = 1106784. Its totient is φ = 311040.

The previous prime is 678871. The next prime is 678883. The reversal of 678878 is 878876.

678878 = T₁₃₇ + T₁₃₈ + ... + T₁₈₇.

It is a happy number.

It is a congruent number.

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

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1151 + ... + 1637.

It is an arithmetic number, because the mean of its divisors is an integer number (69174).

2⁶⁷⁸⁸⁷⁸ is an apocalyptic number.

678878 is a deficient number, since it is larger than the sum of its proper divisors (427906).

678878 is a wasteful number, since it uses less digits than its factorization.

678878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 547.

The product of its digits is 150528, while the sum is 44.

The square root of 678878 is about 823.9405318347. The cubic root of 678878 is about 87.8882016915. Note that the first 3 decimals are identical.

The spelling of 678878 in words is "six hundred seventy-eight thousand, eight hundred seventy-eight".