678673 has 4 divisors (see below), whose sum is σ = 695268. Its totient is φ = 662080.

The previous prime is 678659. The next prime is 678719. The reversal of 678673 is 376876.

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

It can be written as a sum of positive squares in 2 ways, for example, as 345744 + 332929 = 588^2 + 577^2 .

It is a cyclic number.

It is not a de Polignac number, because 678673 - 2⁵ = 678641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (678653) 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, 8236 + ... + 8317.

It is an arithmetic number, because the mean of its divisors is an integer number (173817).

2⁶⁷⁸⁶⁷³ is an apocalyptic number.

It is an amenable number.

678673 is a deficient number, since it is larger than the sum of its proper divisors (16595).

678673 is a wasteful number, since it uses less digits than its factorization.

678673 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16594.

The product of its digits is 42336, while the sum is 37.

The square root of 678673 is about 823.8161202599. The cubic root of 678673 is about 87.8793543016.

It can be divided in two parts, 6786 and 73, that added together give a cube (6859 = 19³).

The spelling of 678673 in words is "six hundred seventy-eight thousand, six hundred seventy-three".