655728 has 40 divisors (see below), whose sum is σ = 1785600. Its totient is φ = 206784.

The previous prime is 655727. The next prime is 655757. The reversal of 655728 is 827556.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (655723) 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, 553 + ... + 1271.

It is an arithmetic number, because the mean of its divisors is an integer number (44640).

2⁶⁵⁵⁷²⁸ 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 655728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (892800).

655728 is an abundant number, since it is smaller than the sum of its proper divisors (1129872).

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

655728 is a wasteful number, since it uses less digits than its factorization.

655728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 749 (or 743 counting only the distinct ones).

The product of its digits is 16800, while the sum is 33.

The square root of 655728 is about 809.7703378119. The cubic root of 655728 is about 86.8776189194.

The spelling of 655728 in words is "six hundred fifty-five thousand, seven hundred twenty-eight".