668194288 has 20 divisors (see below), whose sum is σ = 1300050720.
Its totient is φ = 332697344.
The previous prime is 668194271. The next prime is 668194309. The reversal of 668194288 is 882491866.
It is a congruent number.
It is an unprimeable number.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 83545 + ... + 91192.
It is an arithmetic number, because the mean of its divisors is an integer number (65002536).
Almost surely, 2668194288 is an apocalyptic number.
It is an amenable number.
668194288 is a deficient number, since it is larger than the sum of its proper divisors (631856432).
668194288 is a wasteful number, since it uses less digits than its factorization.
668194288 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 174984 (or 174978 counting only the distinct ones).
The product of its digits is 1327104, while the sum is 52.
The square root of 668194288 is about 25849.4543075865.
The cubic root of 668194288 is about 874.2472058085.
The spelling of 668194288 in words is "six hundred sixty-eight million, one hundred ninety-four thousand, two hundred eighty-eight".