128730992 has 80 divisors (see below), whose sum is σ = 283002720. Its totient is φ = 56318976.

The previous prime is 128730989. The next prime is 128730997. The reversal of 128730992 is 299037821.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128730997) 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, 330734 + ... + 331122.

It is an arithmetic number, because the mean of its divisors is an integer number (3537534).

Almost surely, 2^128730992 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 128730992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (141501360).

128730992 is an abundant number, since it is smaller than the sum of its proper divisors (154271728).

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

128730992 is a wasteful number, since it uses less digits than its factorization.

128730992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 490 (or 484 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 41.

The square root of 128730992 is about 11345.9680944378. The cubic root of 128730992 is about 504.9259663389.

The spelling of 128730992 in words is "one hundred twenty-eight million, seven hundred thirty thousand, nine hundred ninety-two".