6720749 has 8 divisors (see below), whose sum is σ = 7811520. Its totient is φ = 5662656.

The previous prime is 6720743. The next prime is 6720751. The reversal of 6720749 is 9470276.

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 6720749 - 2¹² = 6716653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6720743) 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 7 ways as a sum of consecutive naturals, for example, 7724 + ... + 8549.

It is an arithmetic number, because the mean of its divisors is an integer number (976440).

Almost surely, 2^6720749 is an apocalyptic number.

It is an amenable number.

6720749 is a deficient number, since it is larger than the sum of its proper divisors (1090771).

6720749 is a wasteful number, since it uses less digits than its factorization.

6720749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16339.

The product of its (nonzero) digits is 21168, while the sum is 35.

The square root of 6720749 is about 2592.4407418493. The cubic root of 6720749 is about 188.7147699696.

The spelling of 6720749 in words is "six million, seven hundred twenty thousand, seven hundred forty-nine".