9778128 has 80 divisors (see below), whose sum is σ = 27962496. Its totient is φ = 2928640.

The previous prime is 9778127. The next prime is 9778159. The reversal of 9778128 is 8218779.

It is a Cunningham number, because it is equal to 3127²-1.

It is a super-2 number, since 2×9778128² = 191223574368768, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 9778128.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9778121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18508 + ... + 19028.

Almost surely, 2^9778128 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 9778128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13981248).

9778128 is an abundant number, since it is smaller than the sum of its proper divisors (18184368).

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

9778128 is a wasteful number, since it uses less digits than its factorization.

9778128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 572 (or 566 counting only the distinct ones).

The product of its digits is 56448, while the sum is 42.

The square root of 9778128 is about 3126.9998401023. Note that the first 3 decimals coincide. The cubic root of 9778128 is about 213.8381750370.

The spelling of 9778128 in words is "nine million, seven hundred seventy-eight thousand, one hundred twenty-eight".