6721256 has 32 divisors (see below), whose sum is σ = 13546440. Its totient is φ = 3115008.

The previous prime is 6721237. The next prime is 6721259. The reversal of 6721256 is 6521276.

It can be written as a sum of positive squares in 4 ways, for example, as 6584356 + 136900 = 2566^2 + 370^2 .

It is an alternating number because its digits alternate between even and odd.

It is not an unprimeable number, because it can be changed into a prime (6721259) 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, 9590 + ... + 10266.

Almost surely, 2^6721256 is an apocalyptic number.

It is an amenable number.

6721256 is an abundant number, since it is smaller than the sum of its proper divisors (6825184).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6721256 is a wasteful number, since it uses less digits than its factorization.

6721256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 773 (or 769 counting only the distinct ones).

The product of its digits is 5040, while the sum is 29.

The square root of 6721256 is about 2592.5385243039. The cubic root of 6721256 is about 188.7195152732.

The spelling of 6721256 in words is "six million, seven hundred twenty-one thousand, two hundred fifty-six".