66708222 has 48 divisors (see below), whose sum is σ = 156286080. Its totient is φ = 18594576.

The previous prime is 66708199. The next prime is 66708227. The reversal of 66708222 is 22280766.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66708227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 77229 + ... + 78087.

It is an arithmetic number, because the mean of its divisors is an integer number (3255960).

Almost surely, 2^66708222 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66708222, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (78143040).

66708222 is an abundant number, since it is smaller than the sum of its proper divisors (89577858).

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

66708222 is a wasteful number, since it uses less digits than its factorization.

66708222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 957 (or 914 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 33.

The square root of 66708222 is about 8167.5101469175. The cubic root of 66708222 is about 405.5643648497.

Adding to 66708222 its reverse (22280766), we get a palindrome (88988988).

The spelling of 66708222 in words is "sixty-six million, seven hundred eight thousand, two hundred twenty-two".