128168531208 has 48 divisors (see below), whose sum is σ = 350701713180. Its totient is φ = 42282399744.

The previous prime is 128168531207. The next prime is 128168531221. The reversal of 128168531208 is 802135861821.

128168531208 is a `hidden beast` number, since 12 + 81 + 6 + 8 + 531 + 20 + 8 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 126879864804 + 1288666404 = 356202^2 + 35898^2 .

It is not an unprimeable number, because it can be changed into a prime (128168531203) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9168885 + ... + 9182852.

Almost surely, 2^128168531208 is an apocalyptic number.

128168531208 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

128168531208 is an abundant number, since it is smaller than the sum of its proper divisors (222533181972).

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

128168531208 is a wasteful number, since it uses less digits than its factorization.

128168531208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18351846 (or 18351839 counting only the distinct ones).

The product of its (nonzero) digits is 184320, while the sum is 45.

The spelling of 128168531208 in words is "one hundred twenty-eight billion, one hundred sixty-eight million, five hundred thirty-one thousand, two hundred eight".