668020500 has 192 divisors, whose sum is σ = 2470540800. Its totient is φ = 152668800.

The previous prime is 668020489. The next prime is 668020511. The reversal of 668020500 is 5020866.

668020500 is a `hidden beast` number, since 66 + 80 + 20 + 500 = 666.

668020500 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (668020489) and next prime (668020511).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 90966 + ... + 98034.

It is an arithmetic number, because the mean of its divisors is an integer number (12867400).

Almost surely, 2^668020500 is an apocalyptic number.

668020500 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 668020500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1235270400).

668020500 is an abundant number, since it is smaller than the sum of its proper divisors (1802520300).

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

668020500 is a wasteful number, since it uses less digits than its factorization.

668020500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7104 (or 7086 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 668020500 is about 25846.0925480042. The cubic root of 668020500 is about 874.1714060748.

The spelling of 668020500 in words is "six hundred sixty-eight million, twenty thousand, five hundred".