640085359 has 2 divisors, whose sum is σ = 640085360. Its totient is φ = 640085358.

The previous prime is 640085351. The next prime is 640085429. The reversal of 640085359 is 953580046.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 640085359 - 2³ = 640085351 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (640085351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320042679 + 320042680.

It is an arithmetic number, because the mean of its divisors is an integer number (320042680).

Almost surely, 2^640085359 is an apocalyptic number.

640085359 is a deficient number, since it is larger than the sum of its proper divisors (1).

640085359 is an equidigital number, since it uses as much as digits as its factorization.

640085359 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 129600, while the sum is 40.

The square root of 640085359 is about 25299.9082804662. The cubic root of 640085359 is about 861.8121868910.

The spelling of 640085359 in words is "six hundred forty million, eighty-five thousand, three hundred fifty-nine".