678687 has 12 divisors (see below), whose sum is σ = 940680. Its totient is φ = 435232.

The previous prime is 678659. The next prime is 678719. The reversal of 678687 is 786876.

It is not a de Polignac number, because 678687 - 2¹⁸ = 416543 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors.

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 678687.

It is not an unprimeable number, because it can be changed into a prime (678607) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2389 + ... + 2657.

It is an arithmetic number, because the mean of its divisors is an integer number (78390).

2⁶⁷⁸⁶⁸⁷ is an apocalyptic number.

678687 is a deficient number, since it is larger than the sum of its proper divisors (261993).

678687 is a wasteful number, since it uses less digits than its factorization.

678687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 330 (or 301 counting only the distinct ones).

The product of its digits is 112896, while the sum is 42.

The square root of 678687 is about 823.8246172578. The cubic root of 678687 is about 87.8799585703.

The spelling of 678687 in words is "six hundred seventy-eight thousand, six hundred eighty-seven".