6378666 has 32 divisors (see below), whose sum is σ = 15085440. Its totient is φ = 1759296.

The previous prime is 6378629. The next prime is 6378703. The reversal of 6378666 is 6668736.

It is an interprime number because it is at equal distance from previous prime (6378629) and next prime (6378703).

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1401 + ... + 3836.

It is an arithmetic number, because the mean of its divisors is an integer number (471420).

Almost surely, 2^6378666 is an apocalyptic number.

6378666 is an abundant number, since it is smaller than the sum of its proper divisors (8706774).

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

6378666 is a wasteful number, since it uses less digits than its factorization.

6378666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5278.

The product of its digits is 217728, while the sum is 42.

The square root of 6378666 is about 2525.6021064293. The cubic root of 6378666 is about 185.4570244068.

The spelling of 6378666 in words is "six million, three hundred seventy-eight thousand, six hundred sixty-six".