9915578928 has 80 divisors (see below), whose sum is σ = 28523695200. Its totient is φ = 3297957120.

The previous prime is 9915578917. The next prime is 9915578951. The reversal of 9915578928 is 8298755199.

It is a Cunningham number, because it is equal to 99577²-1.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 174258 + ... + 224046.

It is an arithmetic number, because the mean of its divisors is an integer number (356546190).

Almost surely, 2^9915578928 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 9915578928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14261847600).

9915578928 is an abundant number, since it is smaller than the sum of its proper divisors (18608116272).

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

9915578928 is a wasteful number, since it uses less digits than its factorization.

9915578928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50267 (or 50255 counting only the distinct ones).

The product of its digits is 16329600, while the sum is 63.

The square root of 9915578928 is about 99576.9999949788. Note that the first 5 decimals coincide. The cubic root of 9915578928 is about 2148.3548928298.

The spelling of 9915578928 in words is "nine billion, nine hundred fifteen million, five hundred seventy-eight thousand, nine hundred twenty-eight".