6721448 has 8 divisors (see below), whose sum is σ = 12602730. Its totient is φ = 3360720.

The previous prime is 6721447. The next prime is 6721469. The reversal of 6721448 is 8441276.

6721448 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 6543364 + 178084 = 2558^2 + 422^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (6721447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 420083 + ... + 420098.

Almost surely, 2^6721448 is an apocalyptic number.

It is an amenable number.

6721448 is a deficient number, since it is larger than the sum of its proper divisors (5881282).

6721448 is a wasteful number, since it uses less digits than its factorization.

6721448 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 840187 (or 840183 counting only the distinct ones).

The product of its digits is 10752, while the sum is 32.

The square root of 6721448 is about 2592.5755533832. The cubic root of 6721448 is about 188.7213122489.

The spelling of 6721448 in words is "six million, seven hundred twenty-one thousand, four hundred forty-eight".