640414005 has 64 divisors (see below), whose sum is σ = 1287014400. Its totient is φ = 264165120.

The previous prime is 640414003. The next prime is 640414009. The reversal of 640414005 is 500414046.

It is not a de Polignac number, because 640414005 - 2¹ = 640414003 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640414003) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 158551 + ... + 162539.

It is an arithmetic number, because the mean of its divisors is an integer number (20109600).

Almost surely, 2^640414005 is an apocalyptic number.

It is an amenable number.

640414005 is an abundant number, since it is smaller than the sum of its proper divisors (646600395).

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

640414005 is a wasteful number, since it uses less digits than its factorization.

640414005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4154.

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 640414005 is about 25306.4024507633. The cubic root of 640414005 is about 861.9596581950.

The spelling of 640414005 in words is "six hundred forty million, four hundred fourteen thousand, five".