128911157764 has 27 divisors (see below), whose sum is σ = 233146778823. Its totient is φ = 62365595400.

The previous prime is 128911157761. The next prime is 128911157807. The reversal of 128911157764 is 467751119821.

The square root of 128911157764 is 359042.

It is a perfect power (a square), and thus also a powerful number.

It is not an unprimeable number, because it can be changed into a prime (128911157761) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 22257709 + ... + 22263499.

Almost surely, 2^128911157764 is an apocalyptic number.

128911157764 is the 359042-nd square number.

It is an amenable number.

128911157764 is a deficient number, since it is larger than the sum of its proper divisors (104235621059).

128911157764 is an frugal number, since it uses more digits than its factorization.

128911157764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11648 (or 5824 counting only the distinct ones).

The product of its digits is 846720, while the sum is 52.

The spelling of 128911157764 in words is "one hundred twenty-eight billion, nine hundred eleven million, one hundred fifty-seven thousand, seven hundred sixty-four".