678799 has 8 divisors (see below), whose sum is σ = 772992. Its totient is φ = 590040.

The previous prime is 678779. The next prime is 678809. The reversal of 678799 is 997876.

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

It is not a de Polignac number, because 678799 - 2⁵ = 678767 is a prime.

678799 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (678719) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1089 + ... + 1594.

It is an arithmetic number, because the mean of its divisors is an integer number (96624).

2⁶⁷⁸⁷⁹⁹ is an apocalyptic number.

678799 is a deficient number, since it is larger than the sum of its proper divisors (94193).

678799 is a wasteful number, since it uses less digits than its factorization.

678799 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2717.

The product of its digits is 190512, while the sum is 46.

The square root of 678799 is about 823.8925900868. The cubic root of 678799 is about 87.8847924205.

It can be divided in two parts, 6787 and 99, that added together give a palindrome (6886).

The spelling of 678799 in words is "six hundred seventy-eight thousand, seven hundred ninety-nine".