66423144 has 64 divisors (see below), whose sum is σ = 171864000. Its totient is φ = 21381120.

The previous prime is 66423143. The next prime is 66423163. The reversal of 66423144 is 44132466.

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (66423143) 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, 85992 + ... + 86760.

It is an arithmetic number, because the mean of its divisors is an integer number (2685375).

Almost surely, 2^66423144 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 66423144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (85932000).

66423144 is an abundant number, since it is smaller than the sum of its proper divisors (105440856).

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

66423144 is a wasteful number, since it uses less digits than its factorization.

66423144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 898 (or 894 counting only the distinct ones).

The product of its digits is 13824, while the sum is 30.

The square root of 66423144 is about 8150.0395091067. The cubic root of 66423144 is about 404.9858126413.

The spelling of 66423144 in words is "sixty-six million, four hundred twenty-three thousand, one hundred forty-four".