128836487845 has 16 divisors (see below), whose sum is σ = 166514891760. Its totient is φ = 95130215424.

The previous prime is 128836487783. The next prime is 128836487849. The reversal of 128836487845 is 548784638821.

It is a Cunningham number, because it is equal to 358938²+1.

It can be written as a sum of positive squares in 8 ways, for example, as 82455696801 + 46380791044 = 287151^2 + 215362^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128836487845 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128836487849) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 505341 + ... + 716269.

It is an arithmetic number, because the mean of its divisors is an integer number (10407180735).

Almost surely, 2^128836487845 is an apocalyptic number.

It is an amenable number.

128836487845 is a deficient number, since it is larger than the sum of its proper divisors (37678403915).

128836487845 is a wasteful number, since it uses less digits than its factorization.

128836487845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220344.

The product of its digits is 82575360, while the sum is 64.

The spelling of 128836487845 in words is "one hundred twenty-eight billion, eight hundred thirty-six million, four hundred eighty-seven thousand, eight hundred forty-five".