66740128 has 144 divisors (see below), whose sum is σ = 170444736. Its totient is φ = 25159680.

The previous prime is 66740111. The next prime is 66740129. The reversal of 66740128 is 82104766.

It is a zygodrome in base 4.

It is a junction number, because it is equal to n+sod(n) for n = 66740093 and 66740102.

It is not an unprimeable number, because it can be changed into a prime (66740129) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1552075 + ... + 1552117.

It is an arithmetic number, because the mean of its divisors is an integer number (1183644).

Almost surely, 2^66740128 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 66740128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (85222368).

66740128 is an abundant number, since it is smaller than the sum of its proper divisors (103704608).

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

66740128 is a wasteful number, since it uses less digits than its factorization.

66740128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127 (or 106 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 34.

The square root of 66740128 is about 8169.4631402559. The cubic root of 66740128 is about 405.6290139227.

The spelling of 66740128 in words is "sixty-six million, seven hundred forty thousand, one hundred twenty-eight".