668028528444 has 96 divisors (see below), whose sum is σ = 1637667795456. Its totient is φ = 211537751040.

The previous prime is 668028528403. The next prime is 668028528449. The reversal of 668028528444 is 444825820866.

It is a super-2 number, since 2×668028528444² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668028528449) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 23795664 + ... + 23823720.

It is an arithmetic number, because the mean of its divisors is an integer number (17059039536).

Almost surely, 2^668028528444 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 668028528444, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (818833897728).

668028528444 is an abundant number, since it is smaller than the sum of its proper divisors (969639267012).

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

668028528444 is a wasteful number, since it uses less digits than its factorization.

668028528444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28675 (or 28673 counting only the distinct ones).

The product of its (nonzero) digits is 23592960, while the sum is 57.

The spelling of 668028528444 in words is "six hundred sixty-eight billion, twenty-eight million, five hundred twenty-eight thousand, four hundred forty-four".