6444256 has 48 divisors (see below), whose sum is σ = 15621984. Its totient is φ = 2548224.

The previous prime is 6444233. The next prime is 6444259. The reversal of 6444256 is 6524446.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6444259) 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, 1806 + ... + 4018.

It is an arithmetic number, because the mean of its divisors is an integer number (325458).

Almost surely, 2^6444256 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6444256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7810992).

6444256 is an abundant number, since it is smaller than the sum of its proper divisors (9177728).

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

6444256 is a wasteful number, since it uses less digits than its factorization.

6444256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2243 (or 2235 counting only the distinct ones).

The product of its digits is 23040, while the sum is 31.

The square root of 6444256 is about 2538.5539190649. The cubic root of 6444256 is about 186.0905251720.

It can be divided in two parts, 644 and 4256, that added together give a square (4900 = 70²).

The spelling of 6444256 in words is "six million, four hundred forty-four thousand, two hundred fifty-six".