6680721 has 8 divisors (see below), whose sum is σ = 9097344. Its totient is φ = 4358960.

The previous prime is 6680699. The next prime is 6680731. The reversal of 6680721 is 1270866.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6680721 - 2⁵ = 6680689 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6680731) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 23550 + ... + 23831.

It is an arithmetic number, because the mean of its divisors is an integer number (1137168).

Almost surely, 2^6680721 is an apocalyptic number.

It is an amenable number.

6680721 is a deficient number, since it is larger than the sum of its proper divisors (2416623).

6680721 is a wasteful number, since it uses less digits than its factorization.

6680721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47431.

The product of its (nonzero) digits is 4032, while the sum is 30.

The square root of 6680721 is about 2584.7090745382. The cubic root of 6680721 is about 188.3393692865.

The spelling of 6680721 in words is "six million, six hundred eighty thousand, seven hundred twenty-one".