6720687 has 6 divisors (see below), whose sum is σ = 9707672. Its totient is φ = 4480452.

The previous prime is 6720683. The next prime is 6720691. The reversal of 6720687 is 7860276.

It is an interprime number because it is at equal distance from previous prime (6720683) and next prime (6720691).

It is not a de Polignac number, because 6720687 - 2² = 6720683 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 (6720683) 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 5 ways as a sum of consecutive naturals, for example, 373363 + ... + 373380.

Almost surely, 2^6720687 is an apocalyptic number.

6720687 is a deficient number, since it is larger than the sum of its proper divisors (2986985).

6720687 is a wasteful number, since it uses less digits than its factorization.

6720687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 746749 (or 746746 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 36.

The square root of 6720687 is about 2592.4287839785. The cubic root of 6720687 is about 188.7141896597.

The spelling of 6720687 in words is "six million, seven hundred twenty thousand, six hundred eighty-seven".