668454912 has 78 divisors (see below), whose sum is σ = 1930962722. Its totient is φ = 222806016.

The previous prime is 668454907. The next prime is 668454923. The reversal of 668454912 is 219454866.

It can be written as a sum of positive squares in only one way, i.e., 548683776 + 119771136 = 23424^2 + 10944^2 .

It is a congruent number.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 27798 + ... + 45930.

Almost surely, 2^668454912 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 668454912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (965481361).

668454912 is an abundant number, since it is smaller than the sum of its proper divisors (1262507810).

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

668454912 is a wasteful number, since it uses less digits than its factorization.

668454912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18163 (or 18138 counting only the distinct ones).

The product of its digits is 414720, while the sum is 45.

The square root of 668454912 is about 25854.4950057045. The cubic root of 668454912 is about 874.3608554813.

The spelling of 668454912 in words is "six hundred sixty-eight million, four hundred fifty-four thousand, nine hundred twelve".