678999 has 8 divisors (see below), whose sum is σ = 910080. Its totient is φ = 450296.

The previous prime is 678989. The next prime is 679033. The reversal of 678999 is 999876.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 678999 - 2⁷ = 678871 is a prime.

It is a super-2 number, since 2×678999² = 922079284002, which contains 22 as substring.

678999 is a modest number, since divided by 999 gives 678 as remainder.

It is a plaindrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (678949) 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 7 ways as a sum of consecutive naturals, for example, 244 + ... + 1190.

It is an arithmetic number, because the mean of its divisors is an integer number (113760).

2⁶⁷⁸⁹⁹⁹ is an apocalyptic number.

678999 is a deficient number, since it is larger than the sum of its proper divisors (231081).

678999 is a wasteful number, since it uses less digits than its factorization.

678999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1189.

The product of its digits is 244944, while the sum is 48.

The square root of 678999 is about 824.0139561925. The cubic root of 678999 is about 87.8934229736.

The spelling of 678999 in words is "six hundred seventy-eight thousand, nine hundred ninety-nine".