640160 has 24 divisors (see below), whose sum is σ = 1512756. Its totient is φ = 256000.

The previous prime is 640153. The next prime is 640163. The reversal of 640160 is 61046.

It can be written as a sum of positive squares in 2 ways, for example, as 559504 + 80656 = 748^2 + 284^2 .

It is not an unprimeable number, because it can be changed into a prime (640163) 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 in 3 ways as a sum of consecutive naturals, for example, 1841 + ... + 2160.

2⁶⁴⁰¹⁶⁰ is an apocalyptic number.

It is an amenable number.

640160 is an abundant number, since it is smaller than the sum of its proper divisors (872596).

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

640160 is a wasteful number, since it uses less digits than its factorization.

640160 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4016 (or 4008 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 640160 is about 800.0999937508. The cubic root of 640160 is about 86.1845684519.

It can be divided in two parts, 640 and 160, that multiplied together give a square (102400 = 320²).

The spelling of 640160 in words is "six hundred forty thousand, one hundred sixty".