2015920128 has 64 divisors (see below), whose sum is σ = 5375967120. Its totient is φ = 671940608.

The previous prime is 2015920091. The next prime is 2015920139. The reversal of 2015920128 is 8210295102.

It is a tau number, because it is divible by the number of its divisors (64).

It is a junction number, because it is equal to n+sod(n) for n = 2015920095 and 2015920104.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 88051 + ... + 108557.

Almost surely, 2^2015920128 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 2015920128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2687983560).

2015920128 is an abundant number, since it is smaller than the sum of its proper divisors (3360046992).

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

2015920128 is an frugal number, since it uses more digits than its factorization.

2015920128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20540 (or 20512 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 30.

The square root of 2015920128 is about 44898.9991870643. Note that the first 3 decimals coincide. The cubic root of 2015920128 is about 1263.2552361008.

The spelling of 2015920128 in words is "two billion, fifteen million, nine hundred twenty thousand, one hundred twenty-eight".