128940140788 has 12 divisors (see below), whose sum is σ = 238918496292. Its totient is φ = 60677713280.

The previous prime is 128940140741. The next prime is 128940140789. The reversal of 128940140788 is 887041049821.

It can be written as a sum of positive squares in 2 ways, for example, as 100234293604 + 28705847184 = 316598^2 + 169428^2 .

It is a super-2 number, since 2×128940140788² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128940140789) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 948089203 + ... + 948089338.

It is an arithmetic number, because the mean of its divisors is an integer number (19909874691).

Almost surely, 2^128940140788 is an apocalyptic number.

It is an amenable number.

128940140788 is a deficient number, since it is larger than the sum of its proper divisors (109978355504).

128940140788 is a wasteful number, since it uses less digits than its factorization.

128940140788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1896178562 (or 1896178560 counting only the distinct ones).

The product of its (nonzero) digits is 1032192, while the sum is 52.

The spelling of 128940140788 in words is "one hundred twenty-eight billion, nine hundred forty million, one hundred forty thousand, seven hundred eighty-eight".