66228020 has 12 divisors (see below), whose sum is σ = 139078884. Its totient is φ = 26491200.

The previous prime is 66227989. The next prime is 66228037. The reversal of 66228020 is 2082266.

It can be written as a sum of positive squares in 2 ways, for example, as 21418384 + 44809636 = 4628^2 + 6694^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1655681 + ... + 1655720.

It is an arithmetic number, because the mean of its divisors is an integer number (11589907).

Almost surely, 2^66228020 is an apocalyptic number.

It is an amenable number.

66228020 is an abundant number, since it is smaller than the sum of its proper divisors (72850864).

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

66228020 is a wasteful number, since it uses less digits than its factorization.

66228020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3311410 (or 3311408 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 66228020 is about 8138.0599653726. The cubic root of 66228020 is about 404.5888628634.

It can be divided in two parts, 662 and 28020, that added together give a palindrome (28682).

The spelling of 66228020 in words is "sixty-six million, two hundred twenty-eight thousand, twenty".