66622272 has 56 divisors (see below), whose sum is σ = 179624736. Its totient is φ = 21785088.

The previous prime is 66622271. The next prime is 66622273. The reversal of 66622272 is 27222666.

It is an interprime number because it is at equal distance from previous prime (66622271) and next prime (66622273).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66622271) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6903 + ... + 13449.

Almost surely, 2^66622272 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 66622272, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (89812368).

66622272 is an abundant number, since it is smaller than the sum of its proper divisors (113002464).

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

66622272 is a wasteful number, since it uses less digits than its factorization.

66622272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6615 (or 6605 counting only the distinct ones).

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

The square root of 66622272 is about 8162.2467495169. The cubic root of 66622272 is about 405.3901072752.

The spelling of 66622272 in words is "sixty-six million, six hundred twenty-two thousand, two hundred seventy-two".