668628943 has 8 divisors (see below), whose sum is σ = 720987120. Its totient is φ = 617987520.

The previous prime is 668628941. The next prime is 668628967. The reversal of 668628943 is 349826866.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 668628943 - 2¹ = 668628941 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668628941) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 428380 + ... + 429937.

It is an arithmetic number, because the mean of its divisors is an integer number (90123390).

Almost surely, 2^668628943 is an apocalyptic number.

668628943 is a deficient number, since it is larger than the sum of its proper divisors (52358177).

668628943 is a wasteful number, since it uses less digits than its factorization.

668628943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 858377.

The product of its digits is 2985984, while the sum is 52.

The square root of 668628943 is about 25857.8603716549. The cubic root of 668628943 is about 874.4367283077.

The spelling of 668628943 in words is "six hundred sixty-eight million, six hundred twenty-eight thousand, nine hundred forty-three".