1668678 has 32 divisors (see below), whose sum is σ = 3687552. Its totient is φ = 499200.

The previous prime is 1668649. The next prime is 1668679. The reversal of 1668678 is 8768661.

It is a nialpdrome in base 6.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1668679) 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 15 ways as a sum of consecutive naturals, for example, 8550 + ... + 8742.

It is an arithmetic number, because the mean of its divisors is an integer number (115236).

2^1668678 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1668678, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1843776).

1668678 is an abundant number, since it is smaller than the sum of its proper divisors (2018874).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1668678 is a wasteful number, since it uses less digits than its factorization.

1668678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 340.

The product of its digits is 96768, while the sum is 42.

The square root of 1668678 is about 1291.7731999078. The cubic root of 1668678 is about 118.6107849639.

It can be divided in two parts, 1668 and 678, that added together give a triangular number (2346 = T₆₈).

The spelling of 1668678 in words is "one million, six hundred sixty-eight thousand, six hundred seventy-eight".