128990308968 has 24 divisors (see below), whose sum is σ = 349348753650. Its totient is φ = 42996769632.

The previous prime is 128990308963. The next prime is 128990308999. The reversal of 128990308968 is 869803099821.

It can be written as a sum of positive squares in only one way, i.e., 82781647524 + 46208661444 = 287718^2 + 214962^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is not an unprimeable number, because it can be changed into a prime (128990308963) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 895765963 + ... + 895766106.

Almost surely, 2^128990308968 is an apocalyptic number.

128990308968 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

128990308968 is an abundant number, since it is smaller than the sum of its proper divisors (220358444682).

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

128990308968 is a wasteful number, since it uses less digits than its factorization.

128990308968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1791532081 (or 1791532074 counting only the distinct ones).

The product of its (nonzero) digits is 13436928, while the sum is 63.

The spelling of 128990308968 in words is "one hundred twenty-eight billion, nine hundred ninety million, three hundred eight thousand, nine hundred sixty-eight".