66407128 has 16 divisors (see below), whose sum is σ = 131067000. Its totient is φ = 31455936.

The previous prime is 66407069. The next prime is 66407189. The reversal of 66407128 is 82170466.

It is a junction number, because it is equal to n+sod(n) for n = 66407093 and 66407102.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 218293 + ... + 218596.

Almost surely, 2^66407128 is an apocalyptic number.

It is an amenable number.

66407128 is a deficient number, since it is larger than the sum of its proper divisors (64659872).

66407128 is a wasteful number, since it uses less digits than its factorization.

66407128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 436914 (or 436910 counting only the distinct ones).

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

The square root of 66407128 is about 8149.0568779461. The cubic root of 66407128 is about 404.9532598603.

The spelling of 66407128 in words is "sixty-six million, four hundred seven thousand, one hundred twenty-eight".