1728256 has 36 divisors (see below), whose sum is σ = 3552472. Its totient is φ = 838656.

The previous prime is 1728253. The next prime is 1728257. The reversal of 1728256 is 6528271.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1728253) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10930 + ... + 11086.

2^1728256 is an apocalyptic number.

1728256 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1728256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1776236).

1728256 is an abundant number, since it is smaller than the sum of its proper divisors (1824216).

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

1728256 is an equidigital number, since it uses as much as digits as its factorization.

1728256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216 (or 202 counting only the distinct ones).

The product of its digits is 6720, while the sum is 31.

The square root of 1728256 is about 1314.6315073054. The cubic root of 1728256 is about 120.0059256333.

The spelling of 1728256 in words is "one million, seven hundred twenty-eight thousand, two hundred fifty-six".