9904128 has 112 divisors (see below), whose sum is σ = 29358336. Its totient is φ = 2949120.

The previous prime is 9904117. The next prime is 9904133. The reversal of 9904128 is 8214099.

It is an Ulam number.

It is a nialpdrome in base 16.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 319473 + ... + 319503.

It is an arithmetic number, because the mean of its divisors is an integer number (262128).

Almost surely, 2^9904128 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 9904128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14679168).

9904128 is an abundant number, since it is smaller than the sum of its proper divisors (19454208).

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

9904128 is a wasteful number, since it uses less digits than its factorization.

9904128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73 (or 49 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 33.

The square root of 9904128 is about 3147.0824584049. The cubic root of 9904128 is about 214.7527570713.

The spelling of 9904128 in words is "nine million, nine hundred four thousand, one hundred twenty-eight".