128135764864 has 32 divisors (see below), whose sum is σ = 255803515200. Its totient is φ = 63934098432.

The previous prime is 128135764831. The next prime is 128135764871. The reversal of 128135764864 is 468467531821.

It is a tau number, because it is divible by the number of its divisors (32).

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, 983637 + ... + 1106260.

It is an arithmetic number, because the mean of its divisors is an integer number (7993859850).

Almost surely, 2^128135764864 is an apocalyptic number.

It is an amenable number.

128135764864 is a deficient number, since it is larger than the sum of its proper divisors (127667750336).

128135764864 is an equidigital number, since it uses as much as digits as its factorization.

128135764864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2090390 (or 2090378 counting only the distinct ones).

The product of its digits is 7741440, while the sum is 55.

The spelling of 128135764864 in words is "one hundred twenty-eight billion, one hundred thirty-five million, seven hundred sixty-four thousand, eight hundred sixty-four".