640305135 has 16 divisors (see below), whose sum is σ = 1138320480. Its totient is φ = 341496000.

The previous prime is 640305089. The next prime is 640305151. The reversal of 640305135 is 531503046.

640305135 is a `hidden beast` number, since 640 + 3 + 0 + 5 + 13 + 5 = 666.

It is not a de Polignac number, because 640305135 - 2¹⁴ = 640288751 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 640305099 and 640305108.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2371366 + ... + 2371635.

It is an arithmetic number, because the mean of its divisors is an integer number (71145030).

Almost surely, 2^640305135 is an apocalyptic number.

640305135 is a deficient number, since it is larger than the sum of its proper divisors (498015345).

640305135 is a wasteful number, since it uses less digits than its factorization.

640305135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4743015 (or 4743009 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 27.

The square root of 640305135 is about 25304.2513226533. The cubic root of 640305135 is about 861.9108112171.

The spelling of 640305135 in words is "six hundred forty million, three hundred five thousand, one hundred thirty-five".