640132 has 6 divisors (see below), whose sum is σ = 1120238. Its totient is φ = 320064.

The previous prime is 640127. The next prime is 640139. The reversal of 640132 is 231046.

It can be written as a sum of positive squares in only one way, i.e., 352836 + 287296 = 594^2 + 536^2 .

640132 is a modest number, since divided by 132 gives 64 as remainder.

It is not an unprimeable number, because it can be changed into a prime (640139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80013 + ... + 80020.

2⁶⁴⁰¹³² is an apocalyptic number.

It is an amenable number.

640132 is a deficient number, since it is larger than the sum of its proper divisors (480106).

640132 is a wasteful number, since it uses less digits than its factorization.

640132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160037 (or 160035 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 640132 is about 800.0824957465. The cubic root of 640132 is about 86.1833118894.

Adding to 640132 its reverse (231046), we get a palindrome (871178).

The spelling of 640132 in words is "six hundred forty thousand, one hundred thirty-two".