128444108881 has 27 divisors (see below), whose sum is σ = 146022486057. Its totient is φ = 112893165000.

The previous prime is 128444108867. The next prime is 128444108917. The reversal of 128444108881 is 188801444821.

The square root of 128444108881 is 358391.

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

It is not a de Polignac number, because 128444108881 - 2¹³ = 128444100689 is a prime.

It is a super-2 number, since 2×128444108881² (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 (128444108801) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 122210806 + ... + 122211856.

Almost surely, 2^128444108881 is an apocalyptic number.

128444108881 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

128444108881 is the 358391-st square number.

128444108881 is the 179196-th centered octagonal number.

It is an amenable number.

128444108881 is a deficient number, since it is larger than the sum of its proper divisors (17578377176).

128444108881 is an frugal number, since it uses more digits than its factorization.

128444108881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2186 (or 1093 counting only the distinct ones).

The product of its (nonzero) digits is 524288, while the sum is 49.

Multiplying 128444108881 by its sum of digits (49), we get a square (6293761335169 = 2508737²).

The spelling of 128444108881 in words is "one hundred twenty-eight billion, four hundred forty-four million, one hundred eight thousand, eight hundred eighty-one".