640588235 has 16 divisors (see below), whose sum is σ = 879076800. Its totient is φ = 438982656.

The previous prime is 640588219. The next prime is 640588303. The reversal of 640588235 is 532885046.

It is not a de Polignac number, because 640588235 - 2⁴ = 640588219 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 640588192 and 640588201.

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, 61271 + ... + 70959.

It is an arithmetic number, because the mean of its divisors is an integer number (54942300).

Almost surely, 2^640588235 is an apocalyptic number.

640588235 is a deficient number, since it is larger than the sum of its proper divisors (238488565).

640588235 is a wasteful number, since it uses less digits than its factorization.

640588235 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11590.

The product of its (nonzero) digits is 230400, while the sum is 41.

The square root of 640588235 is about 25309.8446261529. The cubic root of 640588235 is about 862.0378188915.

The spelling of 640588235 in words is "six hundred forty million, five hundred eighty-eight thousand, two hundred thirty-five".