668134020 has 24 divisors (see below), whose sum is σ = 1870775424. Its totient is φ = 178169056.

The previous prime is 668134007. The next prime is 668134021. The reversal of 668134020 is 20431866.

668134020 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (668134021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5567724 + ... + 5567843.

It is an arithmetic number, because the mean of its divisors is an integer number (77948976).

Almost surely, 2^668134020 is an apocalyptic number.

668134020 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

668134020 is an abundant number, since it is smaller than the sum of its proper divisors (1202641404).

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

668134020 is a wasteful number, since it uses less digits than its factorization.

668134020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11135579 (or 11135577 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 30.

The square root of 668134020 is about 25848.2885313515. The cubic root of 668134020 is about 874.2209206817.

Adding to 668134020 its reverse (20431866), we get a palindrome (688565886).

The spelling of 668134020 in words is "six hundred sixty-eight million, one hundred thirty-four thousand, twenty".