66440244 has 24 divisors (see below), whose sum is σ = 166952800. Its totient is φ = 20443104.

The previous prime is 66440243. The next prime is 66440249. The reversal of 66440244 is 44204466.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66440243) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 212794 + ... + 213105.

Almost surely, 2^66440244 is an apocalyptic number.

It is an amenable number.

66440244 is an abundant number, since it is smaller than the sum of its proper divisors (100512556).

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

66440244 is a wasteful number, since it uses less digits than its factorization.

66440244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 425919 (or 425917 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 30.

The square root of 66440244 is about 8151.0885162658. The cubic root of 66440244 is about 405.0205628944.

The spelling of 66440244 in words is "sixty-six million, four hundred forty thousand, two hundred forty-four".