128849520788 has 6 divisors (see below), whose sum is σ = 225486661386. Its totient is φ = 64424760392.

The previous prime is 128849520731. The next prime is 128849520791. The reversal of 128849520788 is 887025948821.

It can be written as a sum of positive squares in only one way, i.e., 119154755344 + 9694765444 = 345188^2 + 98462^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 128849520788.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16106190095 + ... + 16106190102.

It is an arithmetic number, because the mean of its divisors is an integer number (37581110231).

Almost surely, 2^128849520788 is an apocalyptic number.

It is an amenable number.

128849520788 is a deficient number, since it is larger than the sum of its proper divisors (96637140598).

128849520788 is a wasteful number, since it uses less digits than its factorization.

128849520788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32212380201 (or 32212380199 counting only the distinct ones).

The product of its (nonzero) digits is 20643840, while the sum is 62.

The spelling of 128849520788 in words is "one hundred twenty-eight billion, eight hundred forty-nine million, five hundred twenty thousand, seven hundred eighty-eight".