6378861 has 8 divisors (see below), whose sum is σ = 8517600. Its totient is φ = 4246352.

The previous prime is 6378847. The next prime is 6378863. The reversal of 6378861 is 1688736.

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

It is a cyclic number.

It is not a de Polignac number, because 6378861 - 2⁷ = 6378733 is a prime.

It is a super-3 number, since 3×6378861³ (a number of 21 digits) contains 333 as substring.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6378863) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1990 + ... + 4088.

It is an arithmetic number, because the mean of its divisors is an integer number (1064700).

Almost surely, 2^6378861 is an apocalyptic number.

It is an amenable number.

6378861 is a deficient number, since it is larger than the sum of its proper divisors (2138739).

6378861 is a wasteful number, since it uses less digits than its factorization.

6378861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3115.

The product of its digits is 48384, while the sum is 39.

The square root of 6378861 is about 2525.6407107900. The cubic root of 6378861 is about 185.4589142351.

The spelling of 6378861 in words is "six million, three hundred seventy-eight thousand, eight hundred sixty-one".