668389722 has 192 divisors, whose sum is σ = 1847580672. Its totient is φ = 156816000.

The previous prime is 668389703. The next prime is 668389723. The reversal of 668389722 is 227983866.

It is not an unprimeable number, because it can be changed into a prime (668389723) 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 95 ways as a sum of consecutive naturals, for example, 4426347 + ... + 4426497.

It is an arithmetic number, because the mean of its divisors is an integer number (9622816).

Almost surely, 2^668389722 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 668389722, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (923790336).

668389722 is an abundant number, since it is smaller than the sum of its proper divisors (1179190950).

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

668389722 is a wasteful number, since it uses less digits than its factorization.

668389722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 265 (or 254 counting only the distinct ones).

The product of its digits is 1741824, while the sum is 51.

The square root of 668389722 is about 25853.2342657548. The cubic root of 668389722 is about 874.3324310076.

The spelling of 668389722 in words is "six hundred sixty-eight million, three hundred eighty-nine thousand, seven hundred twenty-two".