640422295 has 4 divisors (see below), whose sum is σ = 768506760. Its totient is φ = 512337832.

The previous prime is 640422287. The next prime is 640422301. The reversal of 640422295 is 592224046.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 592224046 = 2 ⋅296112023.

It is a cyclic number.

It is not a de Polignac number, because 640422295 - 2³ = 640422287 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 640422295.

It is a congruent number.

It is an unprimeable number.

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, 64042225 + ... + 64042234.

It is an arithmetic number, because the mean of its divisors is an integer number (192126690).

Almost surely, 2^640422295 is an apocalyptic number.

640422295 is a deficient number, since it is larger than the sum of its proper divisors (128084465).

640422295 is a wasteful number, since it uses less digits than its factorization.

640422295 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128084464.

The product of its (nonzero) digits is 34560, while the sum is 34.

The square root of 640422295 is about 25306.5662427758. The cubic root of 640422295 is about 861.9633774634.

The spelling of 640422295 in words is "six hundred forty million, four hundred twenty-two thousand, two hundred ninety-five".