640424622 has 16 divisors (see below), whose sum is σ = 1281836160. Its totient is φ = 213310392.

The previous prime is 640424611. The next prime is 640424623. The reversal of 640424622 is 226424046.

It is a self number, because there is not a number n which added to its sum of digits gives 640424622.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640424623) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32548 + ... + 48375.

It is an arithmetic number, because the mean of its divisors is an integer number (80114760).

Almost surely, 2^640424622 is an apocalyptic number.

640424622 is an abundant number, since it is smaller than the sum of its proper divisors (641411538).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

640424622 is a wasteful number, since it uses less digits than its factorization.

640424622 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82247.

The product of its (nonzero) digits is 18432, while the sum is 30.

The square root of 640424622 is about 25306.6122189439. The cubic root of 640424622 is about 861.9644214549.

Adding to 640424622 its reverse (226424046), we get a palindrome (866848668).

The spelling of 640424622 in words is "six hundred forty million, four hundred twenty-four thousand, six hundred twenty-two".