640363027 has 4 divisors (see below), whose sum is σ = 640441656. Its totient is φ = 640284400.

The previous prime is 640362971. The next prime is 640363039. The reversal of 640363027 is 720363046.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 640363027 - 2¹¹ = 640360979 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 640363027.

It is not an unprimeable number, because it can be changed into a prime (640363067) 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 3 ways as a sum of consecutive naturals, for example, 25474 + ... + 43927.

It is an arithmetic number, because the mean of its divisors is an integer number (160110414).

Almost surely, 2^640363027 is an apocalyptic number.

640363027 is a deficient number, since it is larger than the sum of its proper divisors (78629).

640363027 is an equidigital number, since it uses as much as digits as its factorization.

640363027 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78628.

The product of its (nonzero) digits is 18144, while the sum is 31.

The square root of 640363027 is about 25305.3952152500. The cubic root of 640363027 is about 861.9367864562.

The spelling of 640363027 in words is "six hundred forty million, three hundred sixty-three thousand, twenty-seven".