65840005 has 32 divisors (see below), whose sum is σ = 101917440. Its totient is φ = 39621120.

The previous prime is 65840003. The next prime is 65840039. The reversal of 65840005 is 50004856.

It is not a de Polignac number, because 65840005 - 2¹ = 65840003 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65840003) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8217 + ... + 14113.

It is an arithmetic number, because the mean of its divisors is an integer number (3184920).

Almost surely, 2^65840005 is an apocalyptic number.

It is an amenable number.

65840005 is a deficient number, since it is larger than the sum of its proper divisors (36077435).

65840005 is a wasteful number, since it uses less digits than its factorization.

65840005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5949.

The product of its (nonzero) digits is 4800, while the sum is 28.

The square root of 65840005 is about 8114.1854181427. The cubic root of 65840005 is about 403.7971831870.

The spelling of 65840005 in words is "sixty-five million, eight hundred forty thousand, five".