6730821 has 6 divisors (see below), whose sum is σ = 9722310. Its totient is φ = 4487208.

The previous prime is 6730811. The next prime is 6730849. The reversal of 6730821 is 1280376.

It can be written as a sum of positive squares in only one way, i.e., 3381921 + 3348900 = 1839^2 + 1830^2 .

It is not a de Polignac number, because 6730821 - 2¹⁵ = 6698053 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6730811) 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 5 ways as a sum of consecutive naturals, for example, 373926 + ... + 373943.

It is an arithmetic number, because the mean of its divisors is an integer number (1620385).

Almost surely, 2^6730821 is an apocalyptic number.

It is an amenable number.

6730821 is a deficient number, since it is larger than the sum of its proper divisors (2991489).

6730821 is a wasteful number, since it uses less digits than its factorization.

6730821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 747875 (or 747872 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 6730821 is about 2594.3825855105. The cubic root of 6730821 is about 188.8089949062.

The spelling of 6730821 in words is "six million, seven hundred thirty thousand, eight hundred twenty-one".