668761760 has 96 divisors (see below), whose sum is σ = 1654152192. Its totient is φ = 255191040.

The previous prime is 668761741. The next prime is 668761787. The reversal of 668761760 is 67167866.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 361157 + ... + 363003.

It is an arithmetic number, because the mean of its divisors is an integer number (17230752).

Almost surely, 2^668761760 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 668761760, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (827076096).

668761760 is an abundant number, since it is smaller than the sum of its proper divisors (985390432).

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

668761760 is a wasteful number, since it uses less digits than its factorization.

668761760 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1966 (or 1958 counting only the distinct ones).

The product of its (nonzero) digits is 508032, while the sum is 47.

The square root of 668761760 is about 25860.4284573941. The cubic root of 668761760 is about 874.4946240833.

The spelling of 668761760 in words is "six hundred sixty-eight million, seven hundred sixty-one thousand, seven hundred sixty".