65440005 has 16 divisors (see below), whose sum is σ = 104808384. Its totient is φ = 34866560.

The previous prime is 65439961. The next prime is 65440031. The reversal of 65440005 is 50004456.

It is not a de Polignac number, because 65440005 - 2⁷ = 65439877 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22177 + ... + 24953.

It is an arithmetic number, because the mean of its divisors is an integer number (6550524).

Almost surely, 2^65440005 is an apocalyptic number.

It is an amenable number.

65440005 is a deficient number, since it is larger than the sum of its proper divisors (39368379).

65440005 is a wasteful number, since it uses less digits than its factorization.

65440005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4356.

The product of its (nonzero) digits is 2400, while the sum is 24.

The square root of 65440005 is about 8089.4996755053. The cubic root of 65440005 is about 402.9777873630.

The spelling of 65440005 in words is "sixty-five million, four hundred forty thousand, five".