640360 has 32 divisors (see below), whose sum is σ = 1647360. Its totient is φ = 219456.

The previous prime is 640333. The next prime is 640363. The reversal of 640360 is 63046.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (640363) by changing a digit.

640360 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 864 + ... + 1423.

It is an arithmetic number, because the mean of its divisors is an integer number (51480).

2⁶⁴⁰³⁶⁰ is an apocalyptic number.

It is an amenable number.

640360 is an abundant number, since it is smaller than the sum of its proper divisors (1007000).

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

640360 is a wasteful number, since it uses less digits than its factorization.

640360 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2305 (or 2301 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 19.

The square root of 640360 is about 800.2249683683. The cubic root of 640360 is about 86.1935428327.

It can be divided in two parts, 640 and 360, that multiplied together give a square (230400 = 480²).

The spelling of 640360 in words is "six hundred forty thousand, three hundred sixty".