6716721 has 16 divisors (see below), whose sum is σ = 10035648. Its totient is φ = 3960000.

The previous prime is 6716701. The next prime is 6716761. The reversal of 6716721 is 1276176.

It is a happy number.

It is not a de Polignac number, because 6716721 - 2⁹ = 6716209 is a prime.

It is a super-2 number, since 2×6716721² = 90228681983682, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (6716701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1530 + ... + 3971.

It is an arithmetic number, because the mean of its divisors is an integer number (627228).

Almost surely, 2^6716721 is an apocalyptic number.

It is an amenable number.

6716721 is a deficient number, since it is larger than the sum of its proper divisors (3318927).

6716721 is a wasteful number, since it uses less digits than its factorization.

6716721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5552.

The product of its digits is 3528, while the sum is 30.

The square root of 6716721 is about 2591.6637513381. The cubic root of 6716721 is about 188.6770611267.

The spelling of 6716721 in words is "six million, seven hundred sixteen thousand, seven hundred twenty-one".