678422 has 4 divisors (see below), whose sum is σ = 1017636. Its totient is φ = 339210.

The previous prime is 678421. The next prime is 678437. The reversal of 678422 is 224876.

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

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 678422.

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 as a sum of consecutive naturals, namely, 169604 + ... + 169607.

It is an arithmetic number, because the mean of its divisors is an integer number (254409).

2⁶⁷⁸⁴²² is an apocalyptic number.

678422 is a deficient number, since it is larger than the sum of its proper divisors (339214).

678422 is a wasteful number, since it uses less digits than its factorization.

678422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 339213.

The product of its digits is 5376, while the sum is 29.

The square root of 678422 is about 823.6637663513. The cubic root of 678422 is about 87.8685192172.

The spelling of 678422 in words is "six hundred seventy-eight thousand, four hundred twenty-two".