66196224 has 144 divisors (see below), whose sum is σ = 200230240. Its totient is φ = 21565440.

The previous prime is 66196223. The next prime is 66196237. The reversal of 66196224 is 42269166.

It is a tau number, because it is divible by the number of its divisors (144).

It is a Harshad number since it is a multiple of its sum of digits (36).

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

Its product of digits (31104) is a multiple of the sum of its prime factors (243).

It is not an unprimeable number, because it can be changed into a prime (66196223) 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, 421554 + ... + 421710.

Almost surely, 2^66196224 is an apocalyptic number.

66196224 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66196224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (100115120).

66196224 is an abundant number, since it is smaller than the sum of its proper divisors (134034016).

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

66196224 is a wasteful number, since it uses less digits than its factorization.

66196224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243 (or 223 counting only the distinct ones).

The product of its digits is 31104, while the sum is 36.

The square root of 66196224 is about 8136.1061939972. The cubic root of 66196224 is about 404.5241049419.

The spelling of 66196224 in words is "sixty-six million, one hundred ninety-six thousand, two hundred twenty-four".