678793 has 4 divisors (see below), whose sum is σ = 718740. Its totient is φ = 638848.

The previous prime is 678779. The next prime is 678809. The reversal of 678793 is 397876.

678793 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 can be written as a sum of positive squares in 2 ways, for example, as 350464 + 328329 = 592^2 + 573^2 .

It is a cyclic number.

It is not a de Polignac number, because 678793 - 2⁵ = 678761 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (678763) 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, 19948 + ... + 19981.

It is an arithmetic number, because the mean of its divisors is an integer number (179685).

2⁶⁷⁸⁷⁹³ is an apocalyptic number.

It is an amenable number.

678793 is a deficient number, since it is larger than the sum of its proper divisors (39947).

678793 is a wasteful number, since it uses less digits than its factorization.

678793 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39946.

The product of its digits is 63504, while the sum is 40.

The square root of 678793 is about 823.8889488274. Note that the first 3 decimals coincide. The cubic root of 678793 is about 87.8845334777.

The spelling of 678793 in words is "six hundred seventy-eight thousand, seven hundred ninety-three".