66363220 has 48 divisors (see below), whose sum is σ = 173755008. Its totient is φ = 20684160.

The previous prime is 66363173. The next prime is 66363247. The reversal of 66363220 is 2236366.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20007 + ... + 23086.

It is an arithmetic number, because the mean of its divisors is an integer number (3619896).

Almost surely, 2^66363220 is an apocalyptic number.

It is an amenable number.

66363220 is an abundant number, since it is smaller than the sum of its proper divisors (107391788).

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

66363220 is a wasteful number, since it uses less digits than its factorization.

66363220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43120 (or 43118 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 28.

The square root of 66363220 is about 8146.3623783871. The cubic root of 66363220 is about 404.8639892828.

Adding to 66363220 its reverse (2236366), we get a palindrome (68599586).

The spelling of 66363220 in words is "sixty-six million, three hundred sixty-three thousand, two hundred twenty".