66869128 has 32 divisors (see below), whose sum is σ = 132739200. Its totient is φ = 31526208.

The previous prime is 66869123. The next prime is 66869137. The reversal of 66869128 is 82196866.

It is not an unprimeable number, because it can be changed into a prime (66869123) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6625 + ... + 13327.

It is an arithmetic number, because the mean of its divisors is an integer number (4148100).

Almost surely, 2^66869128 is an apocalyptic number.

It is an amenable number.

66869128 is a deficient number, since it is larger than the sum of its proper divisors (65870072).

66869128 is a wasteful number, since it uses less digits than its factorization.

66869128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6781 (or 6777 counting only the distinct ones).

The product of its digits is 248832, while the sum is 46.

The square root of 66869128 is about 8177.3545844607. The cubic root of 66869128 is about 405.8901884580.

It can be divided in two parts, 668 and 69128, that added together give a palindrome (69796).

The spelling of 66869128 in words is "sixty-six million, eight hundred sixty-nine thousand, one hundred twenty-eight".