668304020 has 24 divisors (see below), whose sum is σ = 1404988200. Its totient is φ = 267026432.

The previous prime is 668304019. The next prime is 668304037. The reversal of 668304020 is 20403866.

It can be written as a sum of positive squares in 4 ways, for example, as 43903876 + 624400144 = 6626^2 + 24988^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 596 + ... + 36564.

It is an arithmetic number, because the mean of its divisors is an integer number (58541175).

Almost surely, 2^668304020 is an apocalyptic number.

It is an amenable number.

668304020 is an abundant number, since it is smaller than the sum of its proper divisors (736684180).

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

668304020 is a wasteful number, since it uses less digits than its factorization.

668304020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36907 (or 36905 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 29.

The square root of 668304020 is about 25851.5767410810. The cubic root of 668304020 is about 874.2950599757.

Adding to 668304020 its reverse (20403866), we get a palindrome (688707886).

The spelling of 668304020 in words is "six hundred sixty-eight million, three hundred four thousand, twenty".