128718312 has 64 divisors (see below), whose sum is σ = 340032000. Its totient is φ = 40492224.

The previous prime is 128718283. The next prime is 128718313. The reversal of 128718312 is 213817821.

It is not an unprimeable number, because it can be changed into a prime (128718313) 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, 199863 + ... + 200505.

It is an arithmetic number, because the mean of its divisors is an integer number (5313000).

Almost surely, 2^128718312 is an apocalyptic number.

128718312 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 128718312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (170016000).

128718312 is an abundant number, since it is smaller than the sum of its proper divisors (211313688).

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

128718312 is a wasteful number, since it uses less digits than its factorization.

128718312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1110 (or 1106 counting only the distinct ones).

The product of its digits is 5376, while the sum is 33.

The square root of 128718312 is about 11345.4092918678. The cubic root of 128718312 is about 504.9093873955.

The spelling of 128718312 in words is "one hundred twenty-eight million, seven hundred eighteen thousand, three hundred twelve".