6816646 has 4 divisors (see below), whose sum is σ = 10224972. Its totient is φ = 3408322.

The previous prime is 6816631. The next prime is 6816659. The reversal of 6816646 is 6466186.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6466186 = 2 ⋅3233093.

It is a plaindrome in base 12.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1704160 + ... + 1704163.

It is an arithmetic number, because the mean of its divisors is an integer number (2556243).

Almost surely, 2^6816646 is an apocalyptic number.

6816646 is a deficient number, since it is larger than the sum of its proper divisors (3408326).

6816646 is a wasteful number, since it uses less digits than its factorization.

6816646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3408325.

The product of its digits is 41472, while the sum is 37.

The square root of 6816646 is about 2610.8707359806. The cubic root of 6816646 is about 189.6081119272.

The spelling of 6816646 in words is "six million, eight hundred sixteen thousand, six hundred forty-six".