1915915968 has 84 divisors (see below), whose sum is σ = 5584804680. Its totient is φ = 627803136.

The previous prime is 1915915961. The next prime is 1915915973. The reversal of 1915915968 is 8695195191.

It is not an unprimeable number, because it can be changed into a prime (1915915961) 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 11 ways as a sum of consecutive naturals, for example, 5796 + ... + 62172.

It is an arithmetic number, because the mean of its divisors is an integer number (66485770).

Almost surely, 2^1915915968 is an apocalyptic number.

1915915968 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1915915968, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2792402340).

1915915968 is an abundant number, since it is smaller than the sum of its proper divisors (3668888712).

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

1915915968 is a wasteful number, since it uses less digits than its factorization.

1915915968 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56454 (or 56441 counting only the distinct ones).

The product of its digits is 874800, while the sum is 54.

The square root of 1915915968 is about 43771.1773659334. The cubic root of 1915915968 is about 1242.0111242362.

The spelling of 1915915968 in words is "one billion, nine hundred fifteen million, nine hundred fifteen thousand, nine hundred sixty-eight".