66808128 has 28 divisors (see below), whose sum is σ = 176763680. Its totient is φ = 22269312.

The previous prime is 66808109. The next prime is 66808153. The reversal of 66808128 is 82180866.

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, 173788 + ... + 174171.

Almost surely, 2^66808128 is an apocalyptic number.

It is an amenable number.

66808128 is an abundant number, since it is smaller than the sum of its proper divisors (109955552).

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

66808128 is a wasteful number, since it uses less digits than its factorization.

66808128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 347974 (or 347964 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 39.

The square root of 66808128 is about 8173.6239208811. The cubic root of 66808128 is about 405.7667292236.

The spelling of 66808128 in words is "sixty-six million, eight hundred eight thousand, one hundred twenty-eight".