128800566 has 24 divisors (see below), whose sum is σ = 285559560. Its totient is φ = 41934816.

The previous prime is 128800559. The next prime is 128800583. The reversal of 128800566 is 665008821.

It is a happy number.

128800566 is a `hidden beast` number, since 12 + 8 + 80 + 0 + 566 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 128800566.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 82431 + ... + 83978.

It is an arithmetic number, because the mean of its divisors is an integer number (11898315).

Almost surely, 2^128800566 is an apocalyptic number.

128800566 is an abundant number, since it is smaller than the sum of its proper divisors (156758994).

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

128800566 is a wasteful number, since it uses less digits than its factorization.

128800566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166460 (or 166457 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The square root of 128800566 is about 11349.0337033599. The cubic root of 128800566 is about 505.0169141151.

The spelling of 128800566 in words is "one hundred twenty-eight million, eight hundred thousand, five hundred sixty-six".