678838 has 8 divisors (see below), whose sum is σ = 1051200. Its totient is φ = 328440.

The previous prime is 678833. The next prime is 678859. The reversal of 678838 is 838876.

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

It is a plaindrome in base 8.

It is a self number, because there is not a number n which added to its sum of digits gives 678838.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (678833) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5413 + ... + 5536.

It is an arithmetic number, because the mean of its divisors is an integer number (131400).

2⁶⁷⁸⁸³⁸ is an apocalyptic number.

678838 is a deficient number, since it is larger than the sum of its proper divisors (372362).

678838 is a wasteful number, since it uses less digits than its factorization.

678838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10982.

The product of its digits is 64512, while the sum is 40.

The square root of 678838 is about 823.9162578806. The cubic root of 678838 is about 87.8864755114.

The spelling of 678838 in words is "six hundred seventy-eight thousand, eight hundred thirty-eight".