66645288 has 128 divisors (see below), whose sum is σ = 196992000. Its totient is φ = 20839680.

The previous prime is 66645259. The next prime is 66645289. The reversal of 66645288 is 88254666.

It is not an unprimeable number, because it can be changed into a prime (66645289) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 247618 + ... + 247886.

It is an arithmetic number, because the mean of its divisors is an integer number (1539000).

Almost surely, 2^66645288 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66645288, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (98496000).

66645288 is an abundant number, since it is smaller than the sum of its proper divisors (130346712).

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

66645288 is a wasteful number, since it uses less digits than its factorization.

66645288 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 352 (or 342 counting only the distinct ones).

The product of its digits is 552960, while the sum is 45.

The square root of 66645288 is about 8163.6565336864. The cubic root of 66645288 is about 405.4367852813.

It can be divided in two parts, 666 and 45288, that added together give a palindrome (45954).

The spelling of 66645288 in words is "sixty-six million, six hundred forty-five thousand, two hundred eighty-eight".