1728056 has 32 divisors (see below), whose sum is σ = 3596400. Its totient is φ = 771840.

The previous prime is 1728043. The next prime is 1728061. The reversal of 1728056 is 6508271.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6290 + ... + 6558.

2^1728056 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 1728056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1798200).

1728056 is an abundant number, since it is smaller than the sum of its proper divisors (1868344).

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

1728056 is a wasteful number, since it uses less digits than its factorization.

1728056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 359 (or 355 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 29.

The square root of 1728056 is about 1314.5554381615. Note that the first 3 decimals coincide. The cubic root of 1728056 is about 120.0012962823.

It can be divided in two parts, 172 and 8056, that added together give a palindrome (8228).

The spelling of 1728056 in words is "one million, seven hundred twenty-eight thousand, fifty-six".