128548780369 has 9 divisors (see below), whose sum is σ = 129335512873. Its totient is φ = 127766811172.

The previous prime is 128548780313. The next prime is 128548780417. The reversal of 128548780369 is 963087845821.

The square root of 128548780369 is 358537.

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

It is not a de Polignac number, because 128548780369 - 2³³ = 119958845777 is a prime.

It is a super-2 number, since 2×128548780369² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128548780309) 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, 64177122 + ... + 64179124.

It is a 1-persistent number, because it is pandigital, but 2⋅128548780369 = 257097560738 is not.

Almost surely, 2^128548780369 is an apocalyptic number.

128548780369 is the 358537-th square number.

128548780369 is the 179269-th centered octagonal number.

It is an amenable number.

128548780369 is a deficient number, since it is larger than the sum of its proper divisors (786732504).

128548780369 is an frugal number, since it uses more digits than its factorization.

128548780369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4364 (or 2182 counting only the distinct ones).

The product of its (nonzero) digits is 23224320, while the sum is 61.

The spelling of 128548780369 in words is "one hundred twenty-eight billion, five hundred forty-eight million, seven hundred eighty thousand, three hundred sixty-nine".