660809928 has 32 divisors (see below), whose sum is σ = 1655992800. Its totient is φ = 219740928.

The previous prime is 660809927. The next prime is 660809953. The reversal of 660809928 is 829908066.

It is not an unprimeable number, because it can be changed into a prime (660809927) 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 7 ways as a sum of consecutive naturals, for example, 22801 + ... + 42912.

It is an arithmetic number, because the mean of its divisors is an integer number (51749775).

Almost surely, 2^660809928 is an apocalyptic number.

It is an amenable number.

660809928 is an abundant number, since it is smaller than the sum of its proper divisors (995182872).

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

660809928 is a wasteful number, since it uses less digits than its factorization.

660809928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66141 (or 66137 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 48.

The square root of 660809928 is about 25706.2235266093. The cubic root of 660809928 is about 871.0147704601.

The spelling of 660809928 in words is "six hundred sixty million, eight hundred nine thousand, nine hundred twenty-eight".