668999300 has 72 divisors (see below), whose sum is σ = 1553353704. Its totient is φ = 249200640.

The previous prime is 668999299. The next prime is 668999311. The reversal of 668999300 is 3999866.

It can be written as a sum of positive squares in 12 ways, for example, as 104366656 + 564632644 = 10216^2 + 23762^2 .

It is a Harshad number since it is a multiple of its sum of digits (50).

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 23 ways as a sum of consecutive naturals, for example, 162872 + ... + 166928.

It is an arithmetic number, because the mean of its divisors is an integer number (21574357).

Almost surely, 2^668999300 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 668999300, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (776676852).

668999300 is an abundant number, since it is smaller than the sum of its proper divisors (884354404).

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

668999300 is a wasteful number, since it uses less digits than its factorization.

668999300 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4185 (or 4178 counting only the distinct ones).

The product of its (nonzero) digits is 629856, while the sum is 50.

The square root of 668999300 is about 25865.0207809698. The cubic root of 668999300 is about 874.5981501698.

The spelling of 668999300 in words is "six hundred sixty-eight million, nine hundred ninety-nine thousand, three hundred".