6857644 has 6 divisors (see below), whose sum is σ = 12000884. Its totient is φ = 3428820.

The previous prime is 6857639. The next prime is 6857671. The reversal of 6857644 is 4467586.

It is a junction number, because it is equal to n+sod(n) for n = 6857597 and 6857606.

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, 857202 + ... + 857209.

Almost surely, 2^6857644 is an apocalyptic number.

It is an amenable number.

6857644 is a deficient number, since it is larger than the sum of its proper divisors (5143240).

6857644 is a wasteful number, since it uses less digits than its factorization.

6857644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1714415 (or 1714413 counting only the distinct ones).

The product of its digits is 161280, while the sum is 40.

The square root of 6857644 is about 2618.7103696285. The cubic root of 6857644 is about 189.9874783992.

The spelling of 6857644 in words is "six million, eight hundred fifty-seven thousand, six hundred forty-four".