66422272 has 80 divisors (see below), whose sum is σ = 155561472. Its totient is φ = 27740160.

The previous prime is 66422269. The next prime is 66422297. The reversal of 66422272 is 27222466.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 153897 + ... + 154327.

Almost surely, 2^66422272 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 66422272, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (77780736).

66422272 is an abundant number, since it is smaller than the sum of its proper divisors (89139200).

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

66422272 is an equidigital number, since it uses as much as digits as its factorization.

66422272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 499 (or 483 counting only the distinct ones).

The product of its digits is 16128, while the sum is 31.

The square root of 66422272 is about 8149.9860122579. The cubic root of 66422272 is about 404.9840404218.

The spelling of 66422272 in words is "sixty-six million, four hundred twenty-two thousand, two hundred seventy-two".