9907128 has 96 divisors (see below), whose sum is σ = 33471360. Its totient is φ = 2571840.

The previous prime is 9907123. The next prime is 9907147. The reversal of 9907128 is 8217099.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 9907092 and 9907101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9907123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4651 + ... + 6437.

It is an arithmetic number, because the mean of its divisors is an integer number (348660).

Almost surely, 2^9907128 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 9907128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16735680).

9907128 is an abundant number, since it is smaller than the sum of its proper divisors (23564232).

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

9907128 is a wasteful number, since it uses less digits than its factorization.

9907128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1817 (or 1810 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 36.

The square root of 9907128 is about 3147.5590542514. The cubic root of 9907128 is about 214.7744380389.

It can be divided in two parts, 99071 and 28, that added together give a palindrome (99099).

The spelling of 9907128 in words is "nine million, nine hundred seven thousand, one hundred twenty-eight".