678427 has 4 divisors (see below), whose sum is σ = 695016. Its totient is φ = 661840.

The previous prime is 678421. The next prime is 678437. The reversal of 678427 is 724876.

678427 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 678427 - 2⁷ = 678299 is a prime.

It is a Duffinian number.

678427 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 678392 and 678401.

It is not an unprimeable number, because it can be changed into a prime (678421) 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, 8233 + ... + 8314.

It is an arithmetic number, because the mean of its divisors is an integer number (173754).

2⁶⁷⁸⁴²⁷ is an apocalyptic number.

678427 is a deficient number, since it is larger than the sum of its proper divisors (16589).

678427 is a wasteful number, since it uses less digits than its factorization.

678427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16588.

The product of its digits is 18816, while the sum is 34.

The square root of 678427 is about 823.6668015648. Note that the first 3 decimals coincide. The cubic root of 678427 is about 87.8687350816.

The spelling of 678427 in words is "six hundred seventy-eight thousand, four hundred twenty-seven".