66216128 has 28 divisors (see below), whose sum is σ = 143344392. Its totient is φ = 30097920.

The previous prime is 66216109. The next prime is 66216151. The reversal of 66216128 is 82161266.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a junction number, because it is equal to n+sod(n) for n = 66216094 and 66216103.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 46325 + ... + 47732.

Almost surely, 2^66216128 is an apocalyptic number.

It is an amenable number.

66216128 is an abundant number, since it is smaller than the sum of its proper divisors (77128264).

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

66216128 is a wasteful number, since it uses less digits than its factorization.

66216128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94080 (or 94070 counting only the distinct ones).

The product of its digits is 6912, while the sum is 32.

The square root of 66216128 is about 8137.3292916042. The cubic root of 66216128 is about 404.5646452248.

The spelling of 66216128 in words is "sixty-six million, two hundred sixteen thousand, one hundred twenty-eight".