66744312 has 64 divisors (see below), whose sum is σ = 182800800. Its totient is φ = 20213760.

The previous prime is 66744289. The next prime is 66744317. The reversal of 66744312 is 21344766.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66744317) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9012 + ... + 14652.

Almost surely, 2^66744312 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 66744312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (91400400).

66744312 is an abundant number, since it is smaller than the sum of its proper divisors (116056488).

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

66744312 is a wasteful number, since it uses less digits than its factorization.

66744312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5696 (or 5692 counting only the distinct ones).

The product of its digits is 24192, while the sum is 33.

The square root of 66744312 is about 8169.7192118212. The cubic root of 66744312 is about 405.6374901642.

The spelling of 66744312 in words is "sixty-six million, seven hundred forty-four thousand, three hundred twelve".