640422710 has 16 divisors (see below), whose sum is σ = 1160397792. Its totient is φ = 254472000.

The previous prime is 640422697. The next prime is 640422749. The reversal of 640422710 is 17224046.

It is a self number, because there is not a number n which added to its sum of digits gives 640422710.

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 7 ways as a sum of consecutive naturals, for example, 210551 + ... + 213570.

It is an arithmetic number, because the mean of its divisors is an integer number (72524862).

Almost surely, 2^640422710 is an apocalyptic number.

640422710 is a deficient number, since it is larger than the sum of its proper divisors (519975082).

640422710 is a wasteful number, since it uses less digits than its factorization.

640422710 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 424279.

The product of its (nonzero) digits is 2688, while the sum is 26.

The square root of 640422710 is about 25306.5744422275. The cubic root of 640422710 is about 861.9635636503.

Adding to 640422710 its reverse (17224046), we get a palindrome (657646756).

The spelling of 640422710 in words is "six hundred forty million, four hundred twenty-two thousand, seven hundred ten".