128731128 has 16 divisors (see below), whose sum is σ = 321827880. Its totient is φ = 42910368.

The previous prime is 128731081. The next prime is 128731171. The reversal of 128731128 is 821137821.

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, 2681875 + ... + 2681922.

Almost surely, 2^128731128 is an apocalyptic number.

It is an amenable number.

128731128 is an abundant number, since it is smaller than the sum of its proper divisors (193096752).

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

128731128 is a wasteful number, since it uses less digits than its factorization.

128731128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5363806 (or 5363802 counting only the distinct ones).

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

The square root of 128731128 is about 11345.9740877547. The cubic root of 128731128 is about 504.9261441513.

Adding to 128731128 its reverse (821137821), we get a palindrome (949868949).

The spelling of 128731128 in words is "one hundred twenty-eight million, seven hundred thirty-one thousand, one hundred twenty-eight".