6861644 has 6 divisors (see below), whose sum is σ = 12007884. Its totient is φ = 3430820.

The previous prime is 6861629. The next prime is 6861691. The reversal of 6861644 is 4461686.

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 as a sum of consecutive naturals, namely, 857702 + ... + 857709.

It is an arithmetic number, because the mean of its divisors is an integer number (2001314).

Almost surely, 2^6861644 is an apocalyptic number.

It is an amenable number.

6861644 is a deficient number, since it is larger than the sum of its proper divisors (5146240).

6861644 is a wasteful number, since it uses less digits than its factorization.

6861644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1715415 (or 1715413 counting only the distinct ones).

The product of its digits is 27648, while the sum is 35.

The square root of 6861644 is about 2619.4739929994. The cubic root of 6861644 is about 190.0244105294.

The spelling of 6861644 in words is "six million, eight hundred sixty-one thousand, six hundred forty-four".