2091312288 has 144 divisors (see below), whose sum is σ = 6510348936. Its totient is φ = 632862720.

The previous prime is 2091312287. The next prime is 2091312371. The reversal of 2091312288 is 8822131902.

It can be written as a sum of positive squares in 4 ways, for example, as 435473424 + 1655838864 = 20868^2 + 40692^2 .

It is a tau number, because it is divible by the number of its divisors (144).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (2091312281) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 223806 + ... + 232962.

Almost surely, 2^2091312288 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 2091312288, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3255174468).

2091312288 is an abundant number, since it is smaller than the sum of its proper divisors (4419036648).

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

2091312288 is a wasteful number, since it uses less digits than its factorization.

2091312288 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9247 (or 9236 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The square root of 2091312288 is about 45730.8679996346. The cubic root of 2091312288 is about 1278.8108030588.

The spelling of 2091312288 in words is "two billion, ninety-one million, three hundred twelve thousand, two hundred eighty-eight".