128643131380 has 12 divisors (see below), whose sum is σ = 270150575940. Its totient is φ = 51457252544.

The previous prime is 128643131377. The next prime is 128643131417. The reversal of 128643131380 is 83131346821.

It can be written as a sum of positive squares in 2 ways, for example, as 16526645136 + 112116486244 = 128556^2 + 334838^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3216078265 + ... + 3216078304.

It is an arithmetic number, because the mean of its divisors is an integer number (22512547995).

Almost surely, 2^128643131380 is an apocalyptic number.

128643131380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128643131380 is an abundant number, since it is smaller than the sum of its proper divisors (141507444560).

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

128643131380 is a wasteful number, since it uses less digits than its factorization.

128643131380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6432156578 (or 6432156576 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 40.

The spelling of 128643131380 in words is "one hundred twenty-eight billion, six hundred forty-three million, one hundred thirty-one thousand, three hundred eighty".