6490721 has 8 divisors (see below), whose sum is σ = 6678144. Its totient is φ = 6305040.

The previous prime is 6490717. The next prime is 6490733. The reversal of 6490721 is 1270946.

6490721 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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 6490721 - 2² = 6490717 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6490711) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11375 + ... + 11931.

It is an arithmetic number, because the mean of its divisors is an integer number (834768).

Almost surely, 2^6490721 is an apocalyptic number.

It is an amenable number.

6490721 is a deficient number, since it is larger than the sum of its proper divisors (187423).

6490721 is a wasteful number, since it uses less digits than its factorization.

6490721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 871.

The product of its (nonzero) digits is 3024, while the sum is 29.

The square root of 6490721 is about 2547.6893452696. The cubic root of 6490721 is about 186.5367104959.

The spelling of 6490721 in words is "six million, four hundred ninety thousand, seven hundred twenty-one".