66386224 has 40 divisors (see below), whose sum is σ = 137522448. Its totient is φ = 30935040.

The previous prime is 66386219. The next prime is 66386233. The reversal of 66386224 is 42268366.

It is a Smith number, since the sum of its digits (37) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27964 + ... + 30244.

Almost surely, 2^66386224 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 66386224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (68761224).

66386224 is an abundant number, since it is smaller than the sum of its proper divisors (71136224).

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

66386224 is a wasteful number, since it uses less digits than its factorization.

66386224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2413 (or 2407 counting only the distinct ones).

The product of its digits is 82944, while the sum is 37.

The square root of 66386224 is about 8147.7741745829. The cubic root of 66386224 is about 404.9107642649.

The spelling of 66386224 in words is "sixty-six million, three hundred eighty-six thousand, two hundred twenty-four".