128949100440 has 64 divisors (see below), whose sum is σ = 407207692800. Its totient is φ = 32576614272.

The previous prime is 128949100439. The next prime is 128949100453. The reversal of 128949100440 is 44001949821.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 128949100392 and 128949100401.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28276032 + ... + 28280591.

It is an arithmetic number, because the mean of its divisors is an integer number (6362620200).

Almost surely, 2^128949100440 is an apocalyptic number.

128949100440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128949100440 is an abundant number, since it is smaller than the sum of its proper divisors (278258592360).

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

128949100440 is a wasteful number, since it uses less digits than its factorization.

128949100440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56556656 (or 56556652 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 42.

The spelling of 128949100440 in words is "one hundred twenty-eight billion, nine hundred forty-nine million, one hundred thousand, four hundred forty".