668444112 has 120 divisors (see below), whose sum is σ = 2162272320. Its totient is φ = 188812800.

The previous prime is 668444089. The next prime is 668444123. The reversal of 668444112 is 211444866.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

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 23 ways as a sum of consecutive naturals, for example, 85987 + ... + 93437.

It is an arithmetic number, because the mean of its divisors is an integer number (18018936).

Almost surely, 2^668444112 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 668444112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1081136160).

668444112 is an abundant number, since it is smaller than the sum of its proper divisors (1493828208).

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

668444112 is a wasteful number, since it uses less digits than its factorization.

668444112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7561 (or 7552 counting only the distinct ones).

The product of its digits is 36864, while the sum is 36.

The square root of 668444112 is about 25854.2861436939. The cubic root of 668444112 is about 874.3561465384.

Adding to 668444112 its reverse (211444866), we get a palindrome (879888978).

The spelling of 668444112 in words is "six hundred sixty-eight million, four hundred forty-four thousand, one hundred twelve".