668194272 has 60 divisors (see below), whose sum is σ = 1965148416. Its totient is φ = 222730560.

The previous prime is 668194271. The next prime is 668194309. The reversal of 668194272 is 272491866.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668194271) by changing a digit.

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 9 ways as a sum of consecutive naturals, for example, 126304 + ... + 131487.

Almost surely, 2^668194272 is an apocalyptic number.

It is an amenable number.

668194272 is an abundant number, since it is smaller than the sum of its proper divisors (1296954144).

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

668194272 is a wasteful number, since it uses less digits than its factorization.

668194272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 257813 (or 257796 counting only the distinct ones).

The product of its digits is 290304, while the sum is 45.

The square root of 668194272 is about 25849.4539981022. The cubic root of 668194272 is about 874.2471988305.

The spelling of 668194272 in words is "six hundred sixty-eight million, one hundred ninety-four thousand, two hundred seventy-two".