66800008 has 32 divisors (see below), whose sum is σ = 137504160. Its totient is φ = 30170880.

The previous prime is 66800003. The next prime is 66800011. The reversal of 66800008 is 80000866.

It is not an unprimeable number, because it can be changed into a prime (66800003) 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, 12016 + ... + 16672.

It is an arithmetic number, because the mean of its divisors is an integer number (4297005).

Almost surely, 2^66800008 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 66800008, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (68752080).

66800008 is an abundant number, since it is smaller than the sum of its proper divisors (70704152).

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

66800008 is a wasteful number, since it uses less digits than its factorization.

66800008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4837 (or 4833 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 66800008 is about 8173.1271860898. The cubic root of 66800008 is about 405.7502893111.

The spelling of 66800008 in words is "sixty-six million, eight hundred thousand, eight".