66368808 has 80 divisors (see below), whose sum is σ = 202815360. Its totient is φ = 20109600.

The previous prime is 66368807. The next prime is 66368831. The reversal of 66368808 is 80886366.

66368808 is a `hidden beast` number, since 6 + 636 + 8 + 8 + 0 + 8 = 666.

It is not an unprimeable number, because it can be changed into a prime (66368801) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 2473 + ... + 11783.

It is an arithmetic number, because the mean of its divisors is an integer number (2535192).

Almost surely, 2^66368808 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 66368808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (101407680).

66368808 is an abundant number, since it is smaller than the sum of its proper divisors (136446552).

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

66368808 is a wasteful number, since it uses less digits than its factorization.

66368808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9340 (or 9327 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 45.

The square root of 66368808 is about 8146.7053463348. The cubic root of 66368808 is about 404.8753525875.

It can be divided in two parts, 66368 and 808, that added together give a palindrome (67176).

The spelling of 66368808 in words is "sixty-six million, three hundred sixty-eight thousand, eight hundred eight".