640240117 has 16 divisors (see below), whose sum is σ = 722050560. Its totient is φ = 562420800.

The previous prime is 640240087. The next prime is 640240123. The reversal of 640240117 is 711042046.

640240117 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 640240117 - 2¹¹ = 640238069 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 640240091 and 640240100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640240217) 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, 377323 + ... + 379015.

It is an arithmetic number, because the mean of its divisors is an integer number (45128160).

Almost surely, 2^640240117 is an apocalyptic number.

It is an amenable number.

640240117 is a deficient number, since it is larger than the sum of its proper divisors (81810443).

640240117 is a wasteful number, since it uses less digits than its factorization.

640240117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2844.

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 640240117 is about 25302.9665652073. The cubic root of 640240117 is about 861.8816367861.

The spelling of 640240117 in words is "six hundred forty million, two hundred forty thousand, one hundred seventeen".