1678668 has 24 divisors (see below), whose sum is σ = 3984960. Its totient is φ = 549840.

The previous prime is 1678657. The next prime is 1678673. The reversal of 1678668 is 8668761.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 478 + ... + 1893.

It is an arithmetic number, because the mean of its divisors is an integer number (166040).

2^1678668 is an apocalyptic number.

It is an amenable number.

1678668 is an abundant number, since it is smaller than the sum of its proper divisors (2306292).

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

1678668 is a wasteful number, since it uses less digits than its factorization.

1678668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2437 (or 2435 counting only the distinct ones).

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

The square root of 1678668 is about 1295.6342076373. The cubic root of 1678668 is about 118.8470128751.

It can be divided in two parts, 1678 and 668, that added together give a triangular number (2346 = T₆₈).

The spelling of 1678668 in words is "one million, six hundred seventy-eight thousand, six hundred sixty-eight".