678669 has 8 divisors (see below), whose sum is σ = 926112. Its totient is φ = 441840.

The previous prime is 678659. The next prime is 678719. The reversal of 678669 is 966876.

It is a happy number.

678669 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 678669 - 2⁴ = 678653 is a prime.

It is a super-2 number, since 2×678669² = 921183223122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 678669.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (678649) 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, 2502 + ... + 2759.

It is an arithmetic number, because the mean of its divisors is an integer number (115764).

2⁶⁷⁸⁶⁶⁹ is an apocalyptic number.

It is an amenable number.

678669 is a deficient number, since it is larger than the sum of its proper divisors (247443).

678669 is a wasteful number, since it uses less digits than its factorization.

678669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5307.

The product of its digits is 108864, while the sum is 42.

The square root of 678669 is about 823.8136925301. The cubic root of 678669 is about 87.8791816519.

The spelling of 678669 in words is "six hundred seventy-eight thousand, six hundred sixty-nine".