6871644 has 36 divisors (see below), whose sum is σ = 18707416. Its totient is φ = 2114208.

The previous prime is 6871639. The next prime is 6871651. The reversal of 6871644 is 4461786.

6871644 is a `hidden beast` number, since 6 + 8 + 7 + 1 + 644 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 6871599 and 6871608.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6874 + ... + 7809.

Almost surely, 2^6871644 is an apocalyptic number.

It is an amenable number.

6871644 is an abundant number, since it is smaller than the sum of its proper divisors (11835772).

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

6871644 is a wasteful number, since it uses less digits than its factorization.

6871644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14706 (or 14701 counting only the distinct ones).

The product of its digits is 32256, while the sum is 36.

The square root of 6871644 is about 2621.3820782175. The cubic root of 6871644 is about 190.1166781030.

The spelling of 6871644 in words is "six million, eight hundred seventy-one thousand, six hundred forty-four".