660928 has 28 divisors (see below), whose sum is σ = 1371600. Its totient is φ = 315392.

The previous prime is 660923. The next prime is 660941. The reversal of 660928 is 829066.

It is a self number, because there is not a number n which added to its sum of digits gives 660928.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1248 + ... + 1696.

2⁶⁶⁰⁹²⁸ 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 660928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (685800).

660928 is an abundant number, since it is smaller than the sum of its proper divisors (710672).

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

660928 is a wasteful number, since it uses less digits than its factorization.

660928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 484 (or 474 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 660928 is about 812.9747843568. The cubic root of 660928 is about 87.1066644343.

The spelling of 660928 in words is "six hundred sixty thousand, nine hundred twenty-eight".