128681440944 has 120 divisors (see below), whose sum is σ = 399175308288. Its totient is φ = 35580101760.

The previous prime is 128681440933. The next prime is 128681440997. The reversal of 128681440944 is 449044186821.

It is a super-2 number, since 2×128681440944² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 809532 + ... + 955355.

Almost surely, 2^128681440944 is an apocalyptic number.

128681440944 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

128681440944 is an abundant number, since it is smaller than the sum of its proper divisors (270493867344).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

128681440944 is a wasteful number, since it uses less digits than its factorization.

128681440944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1764943 (or 1764930 counting only the distinct ones).

The product of its (nonzero) digits is 1769472, while the sum is 51.

The spelling of 128681440944 in words is "one hundred twenty-eight billion, six hundred eighty-one million, four hundred forty thousand, nine hundred forty-four".