6827721 has 8 divisors (see below), whose sum is σ = 9349824. Its totient is φ = 4428720.

The previous prime is 6827699. The next prime is 6827729. The reversal of 6827721 is 1277286.

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

It is not a de Polignac number, because 6827721 - 2¹⁹ = 6303433 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (6827729) 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, 30645 + ... + 30866.

It is an arithmetic number, because the mean of its divisors is an integer number (1168728).

Almost surely, 2^6827721 is an apocalyptic number.

It is an amenable number.

6827721 is a deficient number, since it is larger than the sum of its proper divisors (2522103).

6827721 is a wasteful number, since it uses less digits than its factorization.

6827721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61551.

The product of its digits is 9408, while the sum is 33.

The square root of 6827721 is about 2612.9908151389. The cubic root of 6827721 is about 189.7107417554.

The spelling of 6827721 in words is "six million, eight hundred twenty-seven thousand, seven hundred twenty-one".