2640065389 has 16 divisors (see below), whose sum is σ = 2895359040. Its totient is φ = 2392346880.

The previous prime is 2640065251. The next prime is 2640065423. The reversal of 2640065389 is 9835600462.

It is a cyclic number.

It is not a de Polignac number, because 2640065389 - 2²⁵ = 2606510957 is a prime.

It is a super-3 number, since 3×2640065389³ (a number of 29 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2640065089) 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, 673774 + ... + 677680.

It is an arithmetic number, because the mean of its divisors is an integer number (180959940).

Almost surely, 2^2640065389 is an apocalyptic number.

It is an amenable number.

2640065389 is a deficient number, since it is larger than the sum of its proper divisors (255293651).

2640065389 is a wasteful number, since it uses less digits than its factorization.

2640065389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4860.

The product of its (nonzero) digits is 311040, while the sum is 43.

The square root of 2640065389 is about 51381.5666265637. The cubic root of 2640065389 is about 1382.0960566571.

The spelling of 2640065389 in words is "two billion, six hundred forty million, sixty-five thousand, three hundred eighty-nine".