660489228 has 90 divisors (see below), whose sum is σ = 2008599516. Its totient is φ = 188706672.

The previous prime is 660489223. The next prime is 660489299. The reversal of 660489228 is 822984066.

It is not an unprimeable number, because it can be changed into a prime (660489223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 4926 + ... + 36677.

Almost surely, 2^660489228 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 660489228, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1004299758).

660489228 is an abundant number, since it is smaller than the sum of its proper divisors (1348110288).

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

660489228 is a wasteful number, since it uses less digits than its factorization.

660489228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41633 (or 41615 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 45.

The square root of 660489228 is about 25699.9849805404. The cubic root of 660489228 is about 870.8738425748.

The spelling of 660489228 in words is "six hundred sixty million, four hundred eighty-nine thousand, two hundred twenty-eight".