66306220 has 24 divisors (see below), whose sum is σ = 143007984. Its totient is φ = 25805376.

The previous prime is 66306211. The next prime is 66306221. The reversal of 66306220 is 2260366.

It is not an unprimeable number, because it can be changed into a prime (66306221) 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, 44062 + ... + 45541.

It is an arithmetic number, because the mean of its divisors is an integer number (5958666).

Almost surely, 2^66306220 is an apocalyptic number.

It is an amenable number.

66306220 is an abundant number, since it is smaller than the sum of its proper divisors (76701764).

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

66306220 is a wasteful number, since it uses less digits than its factorization.

66306220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89649 (or 89647 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 25.

The square root of 66306220 is about 8142.8631328299. The cubic root of 66306220 is about 404.7480422385.

Adding to 66306220 its reverse (2260366), we get a palindrome (68566586).

The spelling of 66306220 in words is "sixty-six million, three hundred six thousand, two hundred twenty".