640288552 has 16 divisors (see below), whose sum is σ = 1232988660. Its totient is φ = 311491584.

The previous prime is 640288541. The next prime is 640288553. The reversal of 640288552 is 255882046.

It can be written as a sum of positive squares in 2 ways, for example, as 537590596 + 102697956 = 23186^2 + 10134^2 .

It is not an unprimeable number, because it can be changed into a prime (640288553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1081273 + ... + 1081864.

Almost surely, 2^640288552 is an apocalyptic number.

It is an amenable number.

640288552 is a deficient number, since it is larger than the sum of its proper divisors (592700108).

640288552 is a wasteful number, since it uses less digits than its factorization.

640288552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2163180 (or 2163176 counting only the distinct ones).

The product of its (nonzero) digits is 153600, while the sum is 40.

The square root of 640288552 is about 25303.9236483198. The cubic root of 640288552 is about 861.9033703947.

The spelling of 640288552 in words is "six hundred forty million, two hundred eighty-eight thousand, five hundred fifty-two".