66240244 has 48 divisors (see below), whose sum is σ = 136402560. Its totient is φ = 27561600.

The previous prime is 66240241. The next prime is 66240247. The reversal of 66240244 is 44204266.

It is an interprime number because it is at equal distance from previous prime (66240241) and next prime (66240247).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66240241) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 166654 + ... + 167050.

It is an arithmetic number, because the mean of its divisors is an integer number (2841720).

Almost surely, 2^66240244 is an apocalyptic number.

It is an amenable number.

66240244 is an abundant number, since it is smaller than the sum of its proper divisors (70162316).

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

66240244 is a wasteful number, since it uses less digits than its factorization.

66240244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 568 (or 566 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 28.

The square root of 66240244 is about 8138.8109696687. The cubic root of 66240244 is about 404.6137535869.

The spelling of 66240244 in words is "sixty-six million, two hundred forty thousand, two hundred forty-four".