66628416 has 112 divisors (see below), whose sum is σ = 184855104. Its totient is φ = 21159936.

The previous prime is 66628381. The next prime is 66628417. The reversal of 66628416 is 61482666.

66628416 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66628417) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 589576 + ... + 589688.

It is an arithmetic number, because the mean of its divisors is an integer number (1650492).

Almost surely, 2^66628416 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 66628416, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (92427552).

66628416 is an abundant number, since it is smaller than the sum of its proper divisors (118226688).

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

66628416 is a wasteful number, since it uses less digits than its factorization.

66628416 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 248 (or 238 counting only the distinct ones).

The product of its digits is 82944, while the sum is 39.

The square root of 66628416 is about 8162.6231078006. The cubic root of 66628416 is about 405.4025687749.

The spelling of 66628416 in words is "sixty-six million, six hundred twenty-eight thousand, four hundred sixteen".