640300 has 36 divisors (see below), whose sum is σ = 1466920. Its totient is φ = 241920.

The previous prime is 640279. The next prime is 640303. The reversal of 640300 is 3046.

It is not an unprimeable number, because it can be changed into a prime (640303) by changing a digit.

640300 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 11 ways as a sum of consecutive naturals, for example, 1732 + ... + 2068.

2⁶⁴⁰³⁰⁰ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 640300, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (733460).

640300 is an abundant number, since it is smaller than the sum of its proper divisors (826620).

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

640300 is a wasteful number, since it uses less digits than its factorization.

640300 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 370 (or 363 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 13.

The square root of 640300 is about 800.1874780325. The cubic root of 640300 is about 86.1908507147.

Adding to 640300 its reverse (3046), we get a palindrome (643346).

The spelling of 640300 in words is "six hundred forty thousand, three hundred".