6721056 has 60 divisors (see below), whose sum is σ = 19774062. Its totient is φ = 2239488.

The previous prime is 6721051. The next prime is 6721061. The reversal of 6721056 is 6501276.

It is an interprime number because it is at equal distance from previous prime (6721051) and next prime (6721061).

It can be written as a sum of positive squares in only one way, i.e., 5475600 + 1245456 = 2340^2 + 1116^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

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

6721056 is a modest number, since divided by 1056 gives 672 as remainder.

It is not an unprimeable number, because it can be changed into a prime (6721051) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 1296 + ... + 3888.

Almost surely, 2^6721056 is an apocalyptic number.

It is a pronic number, being equal to 2592×2593.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6721056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9887031).

6721056 is an abundant number, since it is smaller than the sum of its proper divisors (13053006).

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

6721056 is a wasteful number, since it uses less digits than its factorization.

6721056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2615 (or 2598 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 27.

The square root of 6721056 is about 2592.4999517840. The cubic root of 6721056 is about 188.7176433871.

It can be divided in two parts, 672 and 1056, that added together give a cube (1728 = 12³).

The spelling of 6721056 in words is "six million, seven hundred twenty-one thousand, fifty-six".