678893 has 4 divisors (see below), whose sum is σ = 680988. Its totient is φ = 676800.

The previous prime is 678883. The next prime is 678901. The reversal of 678893 is 398876.

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 521284 + 157609 = 722^2 + 397^2 .

It is a cyclic number.

It is not a de Polignac number, because 678893 - 2⁶ = 678829 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 678893.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (678823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 446 + ... + 1247.

It is an arithmetic number, because the mean of its divisors is an integer number (170247).

2⁶⁷⁸⁸⁹³ is an apocalyptic number.

It is an amenable number.

678893 is a deficient number, since it is larger than the sum of its proper divisors (2095).

678893 is a wasteful number, since it uses less digits than its factorization.

678893 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2094.

The product of its digits is 72576, while the sum is 41.

The square root of 678893 is about 823.9496343831. The cubic root of 678893 is about 87.8888489916. Note that the first 4 decimals are identical.

The spelling of 678893 in words is "six hundred seventy-eight thousand, eight hundred ninety-three".