640318935 has 16 divisors (see below), whose sum is σ = 1049499360. Its totient is φ = 333173760.

The previous prime is 640318909. The next prime is 640318949. The reversal of 640318935 is 539813046.

It is not a de Polignac number, because 640318935 - 2⁷ = 640318807 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 640318893 and 640318902.

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, 519970 + ... + 521199.

It is an arithmetic number, because the mean of its divisors is an integer number (65593710).

Almost surely, 2^640318935 is an apocalyptic number.

640318935 is a deficient number, since it is larger than the sum of its proper divisors (409180425).

640318935 is a wasteful number, since it uses less digits than its factorization.

640318935 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1041218.

The product of its (nonzero) digits is 77760, while the sum is 39.

The square root of 640318935 is about 25304.5240026364. The cubic root of 640318935 is about 861.9170032044.

The spelling of 640318935 in words is "six hundred forty million, three hundred eighteen thousand, nine hundred thirty-five".