678766 has 8 divisors (see below), whose sum is σ = 1110744. Its totient is φ = 308520.

The previous prime is 678763. The next prime is 678767. The reversal of 678766 is 667876.

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

It is a plaindrome in base 8.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (678761) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15405 + ... + 15448.

It is an arithmetic number, because the mean of its divisors is an integer number (138843).

2⁶⁷⁸⁷⁶⁶ is an apocalyptic number.

678766 is a deficient number, since it is larger than the sum of its proper divisors (431978).

678766 is a wasteful number, since it uses less digits than its factorization.

678766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30866.

The product of its digits is 84672, while the sum is 40.

The square root of 678766 is about 823.8725629610. The cubic root of 678766 is about 87.8833682163.

It can be divided in two parts, 678 and 766, that added together give a square (1444 = 38²).

The spelling of 678766 in words is "six hundred seventy-eight thousand, seven hundred sixty-six".