66611328 has 64 divisors (see below), whose sum is σ = 202221120. Its totient is φ = 19031040.

The previous prime is 66611327. The next prime is 66611339. The reversal of 66611328 is 82311666.

It is a tau number, because it is divible by the number of its divisors (64).

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

It is not an unprimeable number, because it can be changed into a prime (66611323) by changing a digit.

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, 9703 + ... + 15078.

It is an arithmetic number, because the mean of its divisors is an integer number (3159705).

Almost surely, 2^66611328 is an apocalyptic number.

It is an amenable number.

66611328 is an abundant number, since it is smaller than the sum of its proper divisors (135609792).

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

66611328 is a wasteful number, since it uses less digits than its factorization.

66611328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24805 (or 24793 counting only the distinct ones).

The product of its digits is 10368, while the sum is 33.

The square root of 66611328 is about 8161.5763183346. The cubic root of 66611328 is about 405.3679083311.

The spelling of 66611328 in words is "sixty-six million, six hundred eleven thousand, three hundred twenty-eight".