2640065388 has 96 divisors (see below), whose sum is σ = 6696152064. Its totient is φ = 806396928.

The previous prime is 2640065251. The next prime is 2640065423. The reversal of 2640065388 is 8835600462.

It is a super-3 number, since 3×2640065388³ (a number of 29 digits) contains 333 as substring.

It is a hoax number, since the sum of its digits (42) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2175870 + ... + 2177082.

It is an arithmetic number, because the mean of its divisors is an integer number (69751584).

Almost surely, 2^2640065388 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 2640065388, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3348076032).

2640065388 is an abundant number, since it is smaller than the sum of its proper divisors (4056086676).

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

2640065388 is a wasteful number, since it uses less digits than its factorization.

2640065388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1511 (or 1509 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 42.

The square root of 2640065388 is about 51381.5666168325. The cubic root of 2640065388 is about 1382.0960564826.

The spelling of 2640065388 in words is "two billion, six hundred forty million, sixty-five thousand, three hundred eighty-eight".