640214443 has 32 divisors (see below), whose sum is σ = 750816000. Its totient is φ = 539809920.

The previous prime is 640214437. The next prime is 640214447. The reversal of 640214443 is 344412046.

640214443 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-640214443 is a prime.

It is not an unprimeable number, because it can be changed into a prime (640214447) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3576528 + ... + 3576706.

It is an arithmetic number, because the mean of its divisors is an integer number (23463000).

Almost surely, 2^640214443 is an apocalyptic number.

640214443 is a deficient number, since it is larger than the sum of its proper divisors (110601557).

640214443 is a wasteful number, since it uses less digits than its factorization.

640214443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 475.

The product of its (nonzero) digits is 9216, while the sum is 28.

The square root of 640214443 is about 25302.4592283043. The cubic root of 640214443 is about 861.8701159809.

Adding to 640214443 its reverse (344412046), we get a palindrome (984626489).

The spelling of 640214443 in words is "six hundred forty million, two hundred fourteen thousand, four hundred forty-three".