640007522 has 96 divisors (see below), whose sum is σ = 1290691584. Its totient is φ = 234880800.

The previous prime is 640007513. The next prime is 640007527. The reversal of 640007522 is 225700046.

640007522 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 640007491 and 640007500.

It is not an unprimeable number, because it can be changed into a prime (640007527) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2057747 + ... + 2058057.

It is an arithmetic number, because the mean of its divisors is an integer number (13444704).

Almost surely, 2^640007522 is an apocalyptic number.

640007522 is an abundant number, since it is smaller than the sum of its proper divisors (650684062).

640007522 is a wasteful number, since it uses less digits than its factorization.

640007522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 444 (or 437 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 26.

The square root of 640007522 is about 25298.3699474887. The cubic root of 640007522 is about 861.7772521782. Note that the first 3 decimals are identical.

Adding to 640007522 its reverse (225700046), we get a palindrome (865707568).

The spelling of 640007522 in words is "six hundred forty million, seven thousand, five hundred twenty-two".