128775537578808 has 24 divisors (see below), whose sum is σ = 348767080942800. Its totient is φ = 42925179192912.

The previous prime is 128775537578747. The next prime is 128775537578917. The reversal of 128775537578808 is 808875735577821.

128775537578808 is a `hidden beast` number, since 1 + 2 + 8 + 7 + 7 + 5 + 5 + 37 + 578 + 8 + 0 + 8 = 666.

It is a tau number, because it is divible by the number of its divisors (24).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 894274566448 + ... + 894274566591.

It is an arithmetic number, because the mean of its divisors is an integer number (14531961705950).

Almost surely, 2^{128775537578808} is an apocalyptic number.

128775537578808 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

128775537578808 is an abundant number, since it is smaller than the sum of its proper divisors (219991543363992).

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

128775537578808 is a wasteful number, since it uses less digits than its factorization.

128775537578808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1788549133051 (or 1788549133044 counting only the distinct ones).

The product of its (nonzero) digits is 7375872000, while the sum is 81.

The spelling of 128775537578808 in words is "one hundred twenty-eight trillion, seven hundred seventy-five billion, five hundred thirty-seven million, five hundred seventy-eight thousand, eight hundred eight".