66974128 has 20 divisors (see below), whose sum is σ = 139744528. Its totient is φ = 30911040.

The previous prime is 66974119. The next prime is 66974129. The reversal of 66974128 is 82147966.

It is not an unprimeable number, because it can be changed into a prime (66974129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 160788 + ... + 161203.

Almost surely, 2^66974128 is an apocalyptic number.

It is an amenable number.

66974128 is an abundant number, since it is smaller than the sum of its proper divisors (72770400).

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

66974128 is a wasteful number, since it uses less digits than its factorization.

66974128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 322012 (or 322006 counting only the distinct ones).

The product of its digits is 145152, while the sum is 43.

The square root of 66974128 is about 8183.7722353448. The cubic root of 66974128 is about 406.1025245217.

The spelling of 66974128 in words is "sixty-six million, nine hundred seventy-four thousand, one hundred twenty-eight".