678166 has 8 divisors (see below), whose sum is σ = 1027080. Its totient is φ = 335808.

The previous prime is 678157. The next prime is 678169. The reversal of 678166 is 661876.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (678169) by changing a digit.

678166 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1371 + ... + 1798.

It is an arithmetic number, because the mean of its divisors is an integer number (128385).

2⁶⁷⁸¹⁶⁶ is an apocalyptic number.

678166 is a deficient number, since it is larger than the sum of its proper divisors (348914).

678166 is a wasteful number, since it uses less digits than its factorization.

678166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3278.

The product of its digits is 12096, while the sum is 34.

The square root of 678166 is about 823.5083484701. The cubic root of 678166 is about 87.8574655412.

Subtracting from 678166 its reverse (661876), we obtain a triangular number (16290 = T₁₈₀).

It can be divided in two parts, 6 and 78166, that multiplied together give a triangular number (468996 = T₉₆₈).

The spelling of 678166 in words is "six hundred seventy-eight thousand, one hundred sixty-six".