66626020 has 12 divisors (see below), whose sum is σ = 139914684. Its totient is φ = 26650400.

The previous prime is 66626017. The next prime is 66626029. The reversal of 66626020 is 2062666.

It can be written as a sum of positive squares in 2 ways, for example, as 52533504 + 14092516 = 7248^2 + 3754^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 66626020.

It is not an unprimeable number, because it can be changed into a prime (66626029) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1665631 + ... + 1665670.

It is an arithmetic number, because the mean of its divisors is an integer number (11659557).

Almost surely, 2^66626020 is an apocalyptic number.

It is an amenable number.

66626020 is an abundant number, since it is smaller than the sum of its proper divisors (73288664).

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

66626020 is a wasteful number, since it uses less digits than its factorization.

66626020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3331310 (or 3331308 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 28.

The square root of 66626020 is about 8162.4763399351. The cubic root of 66626020 is about 405.3977092056.

Adding to 66626020 its reverse (2062666), we get a palindrome (68688686).

The spelling of 66626020 in words is "sixty-six million, six hundred twenty-six thousand, twenty".