66979328 has 80 divisors (see below), whose sum is σ = 149521680. Its totient is φ = 29761536.

The previous prime is 66979327. The next prime is 66979331. The reversal of 66979328 is 82397966.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66979327) 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, 192851 + ... + 193197.

It is an arithmetic number, because the mean of its divisors is an integer number (1869021).

Almost surely, 2^66979328 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 66979328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (74760840).

66979328 is an abundant number, since it is smaller than the sum of its proper divisors (82542352).

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

66979328 is a wasteful number, since it uses less digits than its factorization.

66979328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 407 (or 391 counting only the distinct ones).

The product of its digits is 979776, while the sum is 50.

The square root of 66979328 is about 8184.0899310797. The cubic root of 66979328 is about 406.1130344432.

It can be divided in two parts, 669 and 79328, that added together give a palindrome (79997).

The spelling of 66979328 in words is "sixty-six million, nine hundred seventy-nine thousand, three hundred twenty-eight".