678344 has 8 divisors (see below), whose sum is σ = 1271910. Its totient is φ = 339168.

The previous prime is 678343. The next prime is 678367. The reversal of 678344 is 443876.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 438244 + 240100 = 662^2 + 490^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 678344.

It is not an unprimeable number, because it can be changed into a prime (678341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42389 + ... + 42404.

2⁶⁷⁸³⁴⁴ is an apocalyptic number.

It is an amenable number.

678344 is a deficient number, since it is larger than the sum of its proper divisors (593566).

678344 is a wasteful number, since it uses less digits than its factorization.

678344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84799 (or 84795 counting only the distinct ones).

The product of its digits is 16128, while the sum is 32.

The square root of 678344 is about 823.6164155722. The cubic root of 678344 is about 87.8651515949.

The spelling of 678344 in words is "six hundred seventy-eight thousand, three hundred forty-four".