678287 has 4 divisors (see below), whose sum is σ = 683376. Its totient is φ = 673200.

The previous prime is 678253. The next prime is 678289. The reversal of 678287 is 782876.

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

It is a cyclic number.

It is not a de Polignac number, because 678287 - 2¹⁶ = 612751 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 678287.

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 678287.

It is not an unprimeable number, because it can be changed into a prime (678289) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2339 + ... + 2612.

It is an arithmetic number, because the mean of its divisors is an integer number (170844).

2⁶⁷⁸²⁸⁷ is an apocalyptic number.

678287 is a deficient number, since it is larger than the sum of its proper divisors (5089).

678287 is a wasteful number, since it uses less digits than its factorization.

678287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5088.

The product of its digits is 37632, while the sum is 38.

The square root of 678287 is about 823.5818113582. The cubic root of 678287 is about 87.8626904768.

The spelling of 678287 in words is "six hundred seventy-eight thousand, two hundred eighty-seven".