640124017 has 16 divisors (see below), whose sum is σ = 720558720. Its totient is φ = 564233472.

The previous prime is 640123987. The next prime is 640124029. The reversal of 640124017 is 710421046.

It is a cyclic number.

It is not a de Polignac number, because 640124017 - 2²³ = 631735409 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 640123982 and 640124000.

It is not an unprimeable number, because it can be changed into a prime (640124717) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 219513 + ... + 222409.

It is an arithmetic number, because the mean of its divisors is an integer number (45034920).

Almost surely, 2^640124017 is an apocalyptic number.

It is an amenable number.

640124017 is a deficient number, since it is larger than the sum of its proper divisors (80434703).

640124017 is a wasteful number, since it uses less digits than its factorization.

640124017 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3672.

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

The square root of 640124017 is about 25300.6722637957. The cubic root of 640124017 is about 861.8295362775.

The spelling of 640124017 in words is "six hundred forty million, one hundred twenty-four thousand, seventeen".