640244132 has 24 divisors (see below), whose sum is σ = 1223782560. Its totient is φ = 290663360.

The previous prime is 640244119. The next prime is 640244149. The reversal of 640244132 is 231442046.

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, 29219 + ... + 46197.

It is an arithmetic number, because the mean of its divisors is an integer number (50990940).

Almost surely, 2^640244132 is an apocalyptic number.

It is an amenable number.

640244132 is a deficient number, since it is larger than the sum of its proper divisors (583538428).

640244132 is a wasteful number, since it uses less digits than its factorization.

640244132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17851 (or 17849 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 26.

The square root of 640244132 is about 25303.0459036062. The cubic root of 640244132 is about 861.8834384265.

Adding to 640244132 its reverse (231442046), we get a palindrome (871686178).

The spelling of 640244132 in words is "six hundred forty million, two hundred forty-four thousand, one hundred thirty-two".