2091989568 has 112 divisors (see below), whose sum is σ = 5625974016. Its totient is φ = 685977600.

The previous prime is 2091989567. The next prime is 2091989573. The reversal of 2091989568 is 8659891902.

It is not an unprimeable number, because it can be changed into a prime (2091989567) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4518105 + ... + 4518567.

Almost surely, 2^2091989568 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 2091989568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2812987008).

2091989568 is an abundant number, since it is smaller than the sum of its proper divisors (3533984448).

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

2091989568 is a wasteful number, since it uses less digits than its factorization.

2091989568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 812 (or 802 counting only the distinct ones).

The product of its (nonzero) digits is 2799360, while the sum is 57.

The square root of 2091989568 is about 45738.2724640973. The cubic root of 2091989568 is about 1278.9488375208.

The spelling of 2091989568 in words is "two billion, ninety-one million, nine hundred eighty-nine thousand, five hundred sixty-eight".