2311330640 has 20 divisors (see below), whose sum is σ = 5373843924. Its totient is φ = 924532224.

The previous prime is 2311330627. The next prime is 2311330649. The reversal of 2311330640 is 460331132.

It can be written as a sum of positive squares in 2 ways, for example, as 1424005696 + 887324944 = 37736^2 + 29788^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2311330649) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14445737 + ... + 14445896.

Almost surely, 2^2311330640 is an apocalyptic number.

2311330640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2311330640 is an abundant number, since it is smaller than the sum of its proper divisors (3062513284).

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

2311330640 is a wasteful number, since it uses less digits than its factorization.

2311330640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28891646 (or 28891640 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 23.

The square root of 2311330640 is about 48076.3001904265. The cubic root of 2311330640 is about 1322.1701827735.

Adding to 2311330640 its reverse (460331132), we get a palindrome (2771661772).

The spelling of 2311330640 in words is "two billion, three hundred eleven million, three hundred thirty thousand, six hundred forty".